Assertion: piano's note | /r/HasProperty | 21 units wide
Facets:
Source sentences:
text: If, on the other hand, the white keys present themselves with an absolutely equal width of 35 units each to the performer, then the five notes from C through E would be 21 units wide as they entered the instrument, and the seven notes from F through C would be 20 units wide as they entered the instrument.