@libraz/libcantus - v1.1.0
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    Variable RYUKYU_MASKConst

    RYUKYU_MASK: number = ...

    Ryūkyū (琉球), the pentatonic of Okinawan music: offsets {0,4,5,7,11}.

    Two ryūkyū tetrachords a fourth apart: the middle note sits a major third above the lower nuclear tone, which is what puts the two semitone steps under the fourth and the octave.