アコーディオン - 基本形

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Item 2: some explanation here. some explanation here. some explanation here. some explanation here. some explanation here. some explanation here.
Item 3: some explanation here. some explanation here. some explanation here. some explanation here. some explanation here. some explanation here.

Item 1: some explanation here. some explanation here. some explanation here. some explanation here. some explanation here. some explanation here.
Item 2: some explanation here. some explanation here. some explanation here. some explanation here. some explanation here. some explanation here.
Item 3: some explanation here. some explanation here. some explanation here. some explanation here. some explanation here. some explanation here.