IMPORTANCE: IMaj7=IIm7=IIIm7b6b9=IV#4=V7=VIm7b6=VIIdim.
(C) I Maj - (G) V 7 - (D) II b3b7 - (A) VI b3b6b7 - (E) III b3b6b7b9 - (B) VII b3b5b6b7b9 - (F) IV #4
Interesting, insight, brain exercise trivia:  Root Cycle of 5ths for Maj7 Ionian: 
MODE
V b7
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