Assertion: electric organ's keyboard | /r/HasProperty | two octaves
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Source sentences:
text: Current manufacturers of these products, such as Hammond, Roland, Studiologic (formerly known as Fatar), R. W. Designs, mostly sell keyboards with 13-note keyboards (C to C, one octave), 17-note (C to F, an octave and a fourth) keyboards, or 25-note keyboards (C to C, two octaves).