Assertion: concertina's row | /r/HasAspect | black keys
Facets:
Source sentences:
text: Starting with the row closest to the thumb straps: row 1 contains what are black keys on the on the piano and is covered by finger 1 (index finger); rows 2 and 3 have the white notes and are covered by the first and second (middle) fingers, respectively, so that finger 1 does double duty on rows 1 and 2; row 4 once again has black keys only and is covered by the third (ring) finger, while finger 4 (little finger) has its designated “rest[ing]” place.