A child harmonica echo structure

Abstract

This utility model relates to the field of children's accordion technology, specifically a resonant structure for a children's accordion. The structure includes a lower accordion box, a bellows, an upper accordion box, and a keyboard. The upper accordion box and the bellows are connected by an improved bellows frame. The improved bellows frame has a tapered locking part, forming a Mohs tapered sealing structure with the upper accordion box, replacing the traditional rubber sealing method, achieving a glue-free and environmentally friendly seal, significantly improving airtightness and durability. The upper accordion box contains an improved upper soundboard, whose improved reed plate has multiple independent air chambers; the lower accordion box contains an improved lower soundboard, whose improved reed plate has multiple independent air chambers. Each note corresponds to an independent resonance space, effectively isolating airflow and sound wave interference, improving sound purity and resonance effect. This utility model has a reasonable structure, is easy to install, and is suitable for the manufacture and use of children's accordions, improving sound quality stability and loudness while also considering environmental protection and assembly efficiency.

Description

Technical Field

[0001] This utility model relates to the field of children's accordion technology, specifically to an echo structure for a children's accordion. Background Technology

[0002] like Figure 1-5 As shown, the main structure of the children's accordion includes a lower soundbox 1, a bellows 2, and an upper soundbox 4 connected in sequence. Keyboards are located on the lower soundbox 1 and the upper soundbox 4. An existing upper soundboard 6 is fixed to the inner wall of the upper soundbox 4 with screws. Reeds are installed on both sides of the existing upper soundboard 6. An existing lower soundboard 7 is installed between the lower soundbox 1 and the bellows 2. The upper soundboard 62 in the existing upper soundboard 6 serves as the mounting base for the reeds. The first integral soundboard 63 of the existing upper soundboard 62 and the upper soundbox 4 together form a cavity, constituting an air chamber through which airflow passes and excites the reeds to vibrate. The sound production principle of the children's accordion can be summarized as controlling airflow to drive the free reeds to vibrate. Its working process is as follows: The player changes the internal volume of bellows 2 by stretching or squeezing it, thereby creating a positive or negative air pressure difference (airflow) between the lower body 1 and the upper body 4. When the player presses a key, the corresponding airflow passes through one or more valve holes on the fretwork.

[0003] The airflow from bellows 2 preferentially enters the corresponding air chamber through the hole in the existing lower soundboard 7 where the valve is opened. This stimulates vibration; the airflow passes at high speed through the hole in the existing lower soundboard 7, impacting the reed mounted in the hole. The reed vibrates at high speed under elastic action, thus producing a sound of a specific pitch. This valve is controlled by the lower button 11.

[0004] Both the existing upper soundboard 6 and the existing lower soundboard 7 have reed strips on their reeds. These reed strips play a crucial role here; one end of the reed strip is fixed to the fretboard, while the other end can open and close freely to cover the reed. For the reed in the correct airflow direction, its reed strip will be blown open by the airflow, allowing the reed to vibrate fully; while for the reed in the opposite direction, its reed strip will be firmly pressed against the fretboard, remaining silent. The sound produced by the reed vibration is resonated and amplified in the air chamber of the existing lower soundboard 7.

[0005] The existing bellows frame 30 and upper piano box 4 are connected in the following way: Figure 5 As shown, the existing bellows frame 30 includes a base 301 and an annular snap-fit ​​part 302 integrally formed on the base 301. A rubber strip 303 is fitted around the outer ring of the annular snap-fit ​​part 302 and then inserted into the upper piano box 4. The annular snap-fit ​​part 302, the rubber strip 303, and the upper piano box 4 are fixed by screws. The existing bellows frame 30 and the upper piano box 4 are sealed by the rubber strip 303. The rubber strip 303 sealing method is not environmentally friendly, and there is a risk of air leakage as the usage time increases.

[0006] Therefore, improving the sealing effect and safety performance of this children's accordion product is of paramount importance. Utility Model Content

[0007] The purpose of this invention is to improve the sealing effect and safety performance of children's accordions.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: a children's accordion echo structure, comprising a lower accordion box, a bellows, and an upper accordion box. The upper accordion box and the bellows are sealed together by an improved bellows frame. The improved bellows frame includes an integrally formed annular end and a tapered snap-fit ​​part. The outer wall of the tapered snap-fit ​​part is inclined towards its inner wall and is tapered. The tapered snap-fit ​​part and the upper accordion box form a Mohs tapered sealing structure. An improved upper accordion board is installed inside the upper accordion box. The improved upper accordion board includes an improved base plate and an improved accordion grid plate integrally formed with the improved base plate. The improved accordion grid plate is provided with multiple new upper accordion grids, and each new upper accordion grid plate includes at least one independent air box. An improved lower soundboard is installed inside the lower soundbox. The improved lower soundboard includes an improved reed frame and several new lower soundboxes, each of which includes at least one independent air chamber. The improved base plate is provided with new air holes arranged corresponding to the independent air chambers.

[0009] Preferably, the angle of inclination of the outer wall of the tapered snap-fit ​​part towards the inner wall is α, and the size of α does not exceed the standard angle range of the Mohs taper, with α being 2°-3°.

[0010] Preferably, each novel upper vent has at least two independent air boxes, including a first independent air box and a second independent air box that are independent of each other; the improved base plate is provided with a plurality of novel air holes, including a first independent air hole and a second independent air hole that are independent of each other.

[0011] Preferably, each new type of lower fret has at least two independent air chambers, including a first air chamber and a second air chamber that are independent of each other; an air chamber inlet is provided corresponding to the new type of lower fret, and the air chamber inlet is located on the side of the improved lower fretboard facing away from the bellows.

[0012] Preferably, the air inlet of the air chamber has a rectangular structure.

[0013] Preferably, the tapered snap-fit ​​portion of the improved bellows frame is provided with a plurality of first screw holes arranged in a ring, which are fixedly connected to the upper piano box by screws.

[0014] Preferably, the improved upper and lower soundboards are fixedly connected to the corresponding soundboxes via the first bolt hole and the second bolt hole, respectively.

[0015] Preferably, the improved bellows frame and the upper piano box achieve airtightness through a conical interference fit.

[0016] Compared with existing technologies, the advantages and positive effects of this utility model are as follows: improved sealing performance and durability, achieving an environmentally friendly structure; by adopting an improved bellows frame and its tapered locking part, a Mohs tapered sealing structure is formed with the upper instrument body. This is a precise mechanical interference fit, utilizing the tight contact between the conical surfaces to achieve physical sealing. The conical surface fit eliminates the microscopic gaps caused by aging and wear of traditional rubber strips, eliminating the risk of air leakage from a structural principle perspective, ensuring stable airflow in the bellows, and providing a foundation for stable sound quality. It abandons easily aging rubber parts and chemical adhesives; the entire connection structure is made of metal or engineering plastics through machining, with a lifespan consistent with the instrument body, and the materials are easier to recycle, meeting environmental protection requirements.

[0017] Optimizing sound quality for a louder and more stable tone: The core resonance components were redesigned with improvements to the upper and lower soundboards. The traditional first integrated grille was divided into a first and second independent airbox, and the second integrated grille was divided into a first and second air chamber. This reduces sound wave interference; each reed has its own independent resonance cavity (independent airbox / chamber). This structure physically isolates the crosstalk of airflow and the mutual modulation of sound waves between reeds vibrating at different pitches, resulting in purer resonance for each note. The independent, precisely sized cavities more effectively excite and couple sound waves of specific frequencies, improving the conversion efficiency of reed vibration energy into sound energy, thus making the sound louder and maintaining pitch stability under different playing strengths.

[0018] At the connection point, the tapered snap-fit ​​part has self-guiding and centering characteristics. Combined with the first screw hole, installation only requires initial insertion and then tightening the screw, simplifying the tedious process of precise fitting and flattening of traditional rubber strips.

[0019] In the soundboard section, the improved upper and lower soundboards are modularly connected to the soundbox via the first and second bolt holes, eliminating the traditional veneer application process and making the assembly process simpler and more standardized. This design significantly reduces reliance on manual experience, making the assembly process more standardized, improving production efficiency, and making disassembly and replacement during later maintenance exceptionally convenient.

[0020] The improved bellows soundboard replaced the traditional circular air intake with a rectangular air chamber intake. This improves airflow efficiency and enhances the instrument's response speed. With the same opening area, a rectangular hole typically has a larger flow perimeter, effectively increasing the airflow rate per unit time. This allows the bellows airflow to more quickly excite the reeds, improving the instrument's responsiveness and making playing more effortless. Attached Figure Description

[0021] Figure 1 This is a front view of the present utility model; Figure 2This is a front view of the existing upper piano board in the prior art; Figure 3 This is a top view of the existing upper piano board in the prior art; Figure 4 This is a front view of the existing lower piano board in the prior art; Figure 5 This is a schematic diagram of the connection structure between the existing bellows frame and the upper piano box in the prior art; Figure 6 This is the main view of the improved upper piano board proposed in this utility model; Figure 7 This is a top view of the improved upper piano board proposed in this utility model; Figure 8 This is the front view of the improved lower piano board proposed in this utility model; Figure 9 This is a schematic diagram of the improved bellows frame and upper piano box connection structure proposed in this utility model; Figure 10 This is a schematic diagram of the cross-sectional structure of the improved bellows frame proposed in this utility model; Explanation of reference numerals in the attached drawings: 1. Lower body; 11. Lower keys; 2. Bellows; 30. Existing bellows frame; 301. Base; 302. Annular snap-fit ​​part; 303. Rubber strip; 3. Improved bellows frame; 31. Annular end; 32. Tapered snap-fit ​​part; 33. First screw hole; 4. Upper body; 41. Existing air intake plate; 411. Existing air intake hole; 42. Second screw hole; 43. Improved air intake plate; 431. Improved air intake hole; 5. Upper keyboard; 51. Upper keys; 6. Existing upper soundboard; 61. Base plate; 62. Existing upper soundboard; 63. First integrated soundboard; 64. 7. Existing lower soundboard; 71. Reed frame; 72. Second integrated soundboard; 73. Air inlet; 8. Improved upper soundboard; 81. Improved baseboard; 82. Improved soundboard; 83. New upper soundboard; 831. First independent air chamber; 832. Second independent air chamber; 84. New air inlet; 841. First independent air inlet; 842. Second independent air inlet; 85. First bolt hole; 9. Improved lower soundboard; 91. Improved reed frame; 92. New lower soundboard; 921. First air chamber; 922. Second air chamber; 93. Air chamber air inlet; 94. Second bolt hole. Detailed Implementation

[0022] The appearance of the children's accordion in the prior art is different from that of this utility model. Figure 1 Similar to the previous one, it includes the lower guitar body 1, bellows 2, existing bellows frame 30, upper guitar body 4, and upper keyboard 5 connected in sequence. The difference is that the bellows frame in the prior art is... Figure 5The existing bellows frame 30 shown includes a base 301, an annular snap-fit ​​part 302, and a rubber strip 303. The lower keyboard 1 has a lower button 11, and the upper keyboard 5 has an upper button 51. Another difference is that in the prior art, the air intake plate inside the upper keyboard 4 is... Figure 2 The existing air intake plate 41 shown has multiple circular air intake holes 411. In the prior art, the upper piano plate inside the upper piano case 4 is... Figure 2 , Figure 3 The existing upper piano plate 6 shown includes an integrally formed base plate 61 and an existing upper piano grille 62. The existing upper piano grille 62 has a first integral piano grille 63, and the base plate 61 has an integral base plate vent 64. In the prior art, the lower piano plate inside the lower piano body 1 is... Figure 4 The existing lower piano plate 7 shown includes a reed frame 71, multiple second integral piano grilles 72, and multiple air inlets 73. When the reeds vibrate at different pitches, the airflow of the first integral piano grille 63 and the second integral piano grille 72 can crosstalk and the sound waves can modulate each other, resulting in sound wave interference.

[0023] A more important issue is that, as described in the background section, the existing connection method between the bellows frame 30 and the upper piano box 4 is as follows: Figure 5 As shown, the existing bellows frame 30 includes a base 301 and an annular snap-fit ​​part 302 integrally formed on the base 301. A rubber strip 303 is fitted around the outer ring of the annular snap-fit ​​part 302 and then inserted into the upper piano box 4. The annular snap-fit ​​part 302, the rubber strip 303, and the upper piano box 4 are fixed by screws. The existing bellows frame 30 and the upper piano box 4 are sealed by the rubber strip 303. The rubber strip 303 sealing method is not environmentally friendly, and there is a risk of air leakage as the usage time increases.

[0024] To solve the above problems, this utility model provides the following solution: An echo structure for a children's accordion includes a lower accordion body 1, a bellows 2, and an upper accordion body 4. The upper accordion body 4 and the bellows 2 are sealed together by an improved bellows frame 3. The improved bellows frame 3 includes an integrally formed annular end 31 and a tapered locking part 32. The outer wall of the tapered locking part 32 is inclined towards its inner wall at a tapered angle. The tapered locking part 32 and the upper accordion body 4 form a Morse taper sealing structure. The improved bellows frame 3 and the upper accordion body 4 achieve airtightness through an interference fit of the tapered surface. The angle of inclination of the outer wall of the tapered locking part 32 towards its inner wall is α, and the value of α does not exceed the standard angle range of the Morse taper, generally selected as 2°-3°. The tapered locking part 32 of the improved bellows frame 3 is provided with multiple first screw holes 33 arranged in an annular pattern, and is fixedly connected to the upper accordion body 4 by screws.

[0025] An improved upper soundboard 8 is installed inside the upper soundbox 4. The improved upper soundboard 8 includes an improved base plate 81 and an improved fretboard 82 integrally formed with the improved base plate 81. The improved fretboard 82 has multiple new upper frets 83, each of which includes at least one independent air chamber. Preferably, each new upper fretboard 83 has two independent air chambers, including a first independent air chamber 831 and a second independent air chamber 832. The improved base plate 81 has multiple new air holes 84, including a first independent air hole 841 and a second independent air hole 842. The improved base plate 81 has new air holes 84 arranged corresponding to the independent air chambers. The improved upper soundboard 8 is fixedly connected to the corresponding upper soundbox 4 by screws passing through the first bolt holes 85.

[0026] An improved lower soundboard 9 is installed inside the lower soundbox 1. The improved lower soundboard 9 includes an improved reed frame 91 and several new lower soundboxes 92. Each new lower soundbox 92 includes at least one independent air chamber. Each new lower soundbox 92 has two independent air chambers, including a first air chamber 921 and a second air chamber 922. Corresponding to the new lower soundboxes 92, there are air chamber inlets 93, located on the side of the improved lower soundboard 9 facing away from the bellows 2. The air chamber inlets 93 have a rectangular structure. The improved lower soundboard 9 is fixedly connected to the corresponding lower soundbox 1 by screws passing through the second bolt holes 94.

[0027] The main improvement of this utility model lies in the sealing connection structure between the upper piano box 4 and the improved bellows frame 3, see reference. Figure 1 The structure of this utility model includes a lower accordion box 1, a bellows 2, an improved bellows frame 3, and an upper accordion box 4. The lower accordion box 1 has multiple lower buttons 11, and the upper accordion box 4 has an upper keyboard 5 with multiple upper buttons 51. The overall children's accordion has a rectangular structure. The tapered sealing method between the upper accordion box 4 and the improved bellows frame 3 of this utility model is as follows: Figure 9 As shown, Figure 10 The improved bellows frame 3 shown includes an integrally formed annular end 31 and a tapered locking part 32; the tapered locking part 32 has multiple first screw holes 33 arranged in a ring in the middle; the first screw holes 33 connect the tapered locking part 32 and the upper piano box 4 through screws; the outer wall of the tapered locking part 32 is tapered, and the angle of inclination of the outer wall of the tapered locking part 32 towards the inner wall is α. The tapered locking part 32 achieves a seal between the improved bellows frame 3 and the upper piano box 4, with a simpler, more airtight, and more environmentally friendly structure. The tapered sealing structure has better sealing performance, is easier to install, eliminates the traditional rubber strip 303 design, and is more environmentally friendly. The improved upper piano plate 8 installed inside the upper piano box 4 of this utility model is as follows: Figure 6 , Figure 7As shown, the improved upper piano plate 8 includes an improved base plate 81 and an improved fretboard 82 integrally formed from the improved base plate 81. The improved fretboard 82 has a new upper fretboard 83, which includes a first independent air chamber 831 and a second independent air chamber 832. The improved base plate 81 has multiple new air holes 84, including a first independent air hole 841 and a second independent air hole 842. The improved base plate 81 has first bolt holes 85 at both ends, through which bolts are used to install the improved upper piano plate 8 into the upper piano body 4. The improved lower piano plate 9 inside the lower piano body 1 of this utility model is as follows... Figure 8 As shown, the side of the improved lower piano plate 9 facing the bellows 2 is an improved reed frame 91. The improved reed frame 91 is provided with three new lower piano slots 92. Each new lower piano slot 92 includes an independent first air chamber 921 and a second air chamber 922. The side of the improved lower piano plate 9 facing away from the bellows 2 is provided with three air chamber inlets 93 corresponding to the three new lower piano slots 92. The air chamber inlets 93 are rectangular, which can increase the air output. The two ends of the improved lower piano plate 9 are provided with second bolt holes 94. The improved lower piano plate 9 is connected to the lower piano body 1 by screws through the second bolt holes 94.

[0028] The installation process of this utility model is as follows: First, the installation of the bellows frame 3 and the upper piano box 4 is improved: Before installation, ensure that the outer conical surface of the tapered locking part 32 of the improved bellows frame 3 and the inner wall of the upper piano body 4 are clean, dry, and free of oil or burrs. Check the conical surface for visible scratches or deformation, ensuring the smoothness of the mating surfaces. Holding the upper piano body 4, accurately align the inner wall of the tapered locking part 32 and insert it, gently fitting the upper piano body 4 onto the tapered locking part 32. The tapered surface mating has achieved a preliminary sealing effect. At this point, use appropriate screws, such as self-tapping screws or machine screws, depending on the preset thread type, through the first screw hole 33 to firmly secure the improved bellows frame 3 and the upper piano body 4. It is recommended to tighten the screws in a diagonal alternating sequence to ensure even force and consistent sealing surface contact.

[0029] Next is the installation of the improved upper soundboard 8: Place the improved upper soundboard 8 into the predetermined installation position inside the upper soundbox 4. Use bolts to pass through the first bolt holes 85 at both ends of the improved upper soundboard 8 and screw them into the corresponding threaded holes on the inner wall of the upper soundbox 4. Tighten the bolts in a diagonal alternating manner to ensure that the improved upper soundboard 8 is flat and firmly fixed inside the upper soundbox 4, avoiding deformation due to uneven stress, which would affect airtightness and intonation.

[0030] Next, the installation of the improved lower soundboard 9 is performed: Place the improved lower soundboard 9 inside the lower soundbox 1. Note its orientation: the improved reed frame 91 should face the bellows 2, while the side with the air chamber inlet 93 should face away from the bellows. Use screws to pass through the second bolt holes 94 at both ends of the improved lower soundboard 9 to secure it tightly to the lower soundbox 1. Check that the mating surfaces of the improved lower soundboard 9 and the lower soundbox 1 are tight and free from warping.

[0031] The other end of the bellows 2, without the improved bellows frame installed, is connected to the lower piano box 1 using a traditional adhesive bonding method.

[0032] For a preliminary airtightness check, close all valves without pressing any buttons, gently stretch bellows 2 and keep it open. Observe whether bellows 2 automatically and quickly rebounds. If the rebound is slow or almost non-existent, the overall structure has good airtightness. Similarly, close all valves, squeeze bellows 2 and hold. Feel the reaction force of bellows 2 against your palm; if the pressure can be maintained for a period of time, it indicates a good seal. In a quiet environment, quickly open and close bellows 2, and listen close to the upper body 4 for any obvious hissing sound indicating air leakage. Press each upper button 51 and lower button 11 in sequence, and while stretching and squeezing bellows 2, listen to see if each note can be produced normally and loudly, without any extraneous noise or weak volume. This verifies whether the correspondence between the independent air boxes / chambers and the valves is correct, and whether the reeds are working properly.

[0033] This invention employs an improved bellows frame 3 and its tapered locking part 32 to form a Mohs tapered sealing structure with the upper instrument body 4. This is a precise mechanical interference fit, utilizing the tight contact between the tapered surfaces to achieve a physical seal. The tapered surface fit eliminates the microscopic gaps caused by aging and wear of the traditional rubber strip 303, structurally eliminating the risk of air leakage and ensuring stable airflow in the bellows, thus providing a foundation for stable sound quality. It eliminates easily aging rubber parts and chemical adhesives; the entire connection structure is made of metal or engineering plastic through machining, with a lifespan consistent with the instrument body, and the materials are more easily recyclable, meeting environmental protection requirements.

[0034] The core resonance components were optimized by improving the upper soundboard 8 and the lower soundboard 9. The traditional first and second integrated frets 63 and 72 were divided into multiple independent air boxes and chambers. This improved sound quality, resulting in a louder and more stable tone. Multiple independent air boxes and chambers reduce sound wave interference, and each reed has its own independent resonance cavity. This structure physically isolates the crosstalk of airflow and the mutual modulation of sound waves during reed vibrations of different notes, making the resonance of each note purer. The independent, precisely sized small cavities can more effectively excite and couple sound waves of specific frequencies, improving the conversion efficiency of reed vibration energy into sound energy, thus making the sound louder and maintaining pitch stability under different playing strengths.

[0035] At the connection point, the tapered locking part 32 has self-guiding and centering characteristics. Combined with the first screw hole 33, installation only requires initial insertion followed by screw tightening, simplifying the tedious process of precisely fitting and flattening the traditional rubber strip. On the improved lower soundboard 9, the traditional circular air inlet 73 is replaced with a rectangular air chamber inlet 93. This improves airflow efficiency and enhances the instrument's response speed. With the same opening area, a rectangular hole typically has a larger flow perimeter, effectively increasing the airflow per unit time. This allows the bellows airflow to more quickly excite the reeds, improving the instrument's responsiveness and making playing more effortless.

Claims

1. A children's accordion echo structure, comprising a lower soundbox (1), a bellows (2), and an upper soundbox (4), characterized in that: The upper piano body (4) and the bellows (2) are sealed together by an improved bellows frame (3). The improved bellows frame (3) includes an integrally formed annular end (31) and a tapered snap-fit ​​part (32). The outer wall of the tapered snap-fit ​​part (32) is inclined to its inner wall side in a tapered manner. The tapered snap-fit ​​part (32) and the upper piano body (4) form a Morse taper sealing structure. An improved upper piano plate (8) is installed inside the upper piano body (4). The improved upper piano plate (8) includes an improved base plate (81) and an improved piano grille plate (82) integrally formed with the improved base plate (81). The improved piano grille plate (82) is provided with multiple new upper piano grilles (83). Each new upper piano grille plate (83) includes at least one independent air box. An improved lower piano plate (9) is installed inside the lower piano box (1). The improved lower piano plate (9) includes an improved reed frame (91) and several new lower piano slots (92). Each new lower piano slot (92) includes at least one independent air chamber. The improved base plate (81) is provided with new air holes (84) arranged corresponding to the independent air chambers.

2. The echo structure of the children's accordion according to claim 1, characterized in that: The outer wall of the tapered snap-fit ​​part (32) is inclined to the inner wall at an angle of α, and the size of α does not exceed the standard angle range of the Morse taper, and α is 2°-3°.

3. The echo structure of the children's accordion according to claim 1, characterized in that: Each new type of upper plate (83) has at least two independent air boxes, including a first independent air box (831) and a second independent air box (832) that are independent of each other; the improved base plate (81) is provided with a plurality of new air holes (84), including a first independent air hole (841) and a second independent air hole (842) that are independent of each other.

4. The echo structure of the children's accordion according to claim 1, characterized in that: Each new type of lower sill (92) has at least two independent air chambers, including a first air chamber (921) and a second air chamber (922) that are independent of each other; an air chamber inlet (93) is provided corresponding to the new type of lower sill (92), and the air chamber inlet (93) is located on the side of the improved lower sill (9) facing away from the bellows (2).

5. The echo structure of the children's accordion according to claim 1, characterized in that: The air inlet (93) of the air chamber has a rectangular structure.

6. The echo structure of the children's accordion according to claim 1, characterized in that: The tapered snap-fit ​​part (32) of the improved bellows frame (3) is provided with a plurality of first screw holes (33) arranged in a ring, which are fixedly connected to the upper piano box (4) by screws.

7. The echo structure of the children's accordion according to claim 1, characterized in that: The improved upper soundboard (8) and the improved lower soundboard (9) are fixedly connected to the corresponding soundboxes through the first bolt hole (85) and the second bolt hole (94), respectively.

8. The echo structure of the children's accordion according to claim 1, characterized in that: The improved bellows frame (3) and upper piano box (4) achieve airtightness by relying on the cone surface interference fit.

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