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81.11Level 3 — C major + B♭ major

LH:

C-E-G.

RH:

B♭-D-F.

Combined pitch set:

C D E F G B♭.

This is essentially:

C Mixolydian/sus-ish material.

But if registers are separated:

you may hear:

C major below

B♭ major above.