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- Left hand
- C3Eb3Gb3C4
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- Triads
The Doubled Root voicing of Cdim stacks C, Eb, Gb and C from the bottom up: the root, minor 3rd, flat 5th and root of the chord.
It's one of the Triads voicings. The others for Cdim are Root Inversion, 1st Inversion and 2nd Inversion.