need to bridge the gaps in the natural scale:
(1) 2 3 4 5 6 7 8 9 10
first mode normally not used - biggest gap is FIFTH
fifth fourth major minor
third third
# semitones: 7 5 4 3
lower pitch 1 semitone by adding length l1 to original length lo
2 l2
3 l3
4 l1 +l3
5 l2 +l3
6 l1+ l2 +l3
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