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;;;; source file of the GNU LilyPond music typesetter
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;;; Note: this file can't be used without LilyPond executable
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(number? (car x)) (number? (cdr x))))
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(define-public (number-or-grob? x)
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(define-public (grob-list? x)
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(ly:moment? (car x)) (ly:moment? (cdr x))))