Assertion: harmonica's triad | /r/HasProperty | b-d-f
Facets:
Source sentences:
text: Holes 3, 4, and 5 form a B diminished triad (B-D-F), written on lines.
text: Holes 7, 8, and 9 form another B diminished triad (B-D-F), written on spaces in between ledger lines above the staff.