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Abstract

It comprises a foot portion having a long rod shape, a flat plate-shaped support member connected to one end of the foot portion, extending in a first direction and having a first plate thickness, an arm member having one end connected to the support member and extending in the longitudinal direction of the foot portion, a flat plate-shaped tip member connected to the other end of the arm member, extending in a first direction and having a first plate thickness, and a contact portion protruding from the tip member toward the first direction. On the outer edge of the support member and the outer edge of the tip member, a projection portion is formed along the first direction with a width narrower than the first plate thickness.

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