The Natural Arrangement warning (see attached view) should be enhanced to be more precise :
- presently : only 9ths and 13ths chords are cited. It is too restrictive and ambiguous, because we may think that only 9ths and 13ths are involved.
- proposal : also add the 7ths and '...' meaning other types of chords

So, regarding the example in question, the right text should be :

46% of the chords are complex (7ths, 9ths, 13ths, ...).

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