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In page Recorder (musical instrument):

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The partial opening of the thumbhole may be achieved by sliding or rolling the thumb off the hole, or by bending the thumb at the first knuckle. To partially uncover a covered hole, the player may slide the finger off the hole, bend or roll the finger away from the hole, gently lift the finger from the hole, or a combination of these. To partially cover an open hole, the reverse is possible.[citation needed]