Description:
Disallows repetitions within a window of a give number of melodic notes or chords.
Args:
voices: the number of the voice(s) to constrain.
window: the number of notes among which no repetition should happen (if this is larger than the currently available number, then simply the available notes are taken).
mode: whether to disallow repeated pitches (:pitches) or pitch classes (:pcs).
Optional arguments are inherited from r-pitches-one-voice.
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