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thumb hole and is operated by the left thumb. The same key used in combination with the left first finger key which produces the written note A₄ (in scientific pitch notation) is used to play B?₄. Some clarinets, particularly bass clarinets and lower, have separate keys, or a more complex key mechanism, to control two or three separate holes for playing B?, for playing the lower notes of the second register, and for playing the upper

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