*These are seventh-chord quality symbols, where the first character is the quality of the triad (M-major, m-minor, o-diminished, +-augmented), and the second two characters are the quality and size of the interval from the root to the seventh (M7-major seventh, m7-minor seventh, and o7-diminished seventh).
There are many alternatives to the above rules, some of which are widely used and accepted. This list is not all-inclusive. There are many other chords beyond the scope of this list.
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