(Check the math on this, I believe Sudre had not exhausted all the combinations of notes. --JS. )
What to make of this? The obvious reason for the missing 3-note combinations would be to disallow combinations like do-do-do. Removing re-do-do-do, do-do-do-re and do-do-do-do explains 105 of the missing 4-note combinations - does anyone have any good ideas for the other 28? Brave enough to try the combinatorics for 5-note words?- GdB.