Assertion: concertina's button | /r/HasProperty | embedded into the surface
Facets:
Source sentences:
text: A concertina makes sound when air is compressed through small holes in the ends of the concertina, and the frequency of the sound is augmented by the 20 or 40 buttons that are embedded into the surface.
text: A concertina makes sound when air is compressed through small holes in the ends of the concertina, and the frequency of the sound is augmented by the 20 or 40 buttons that are embedded into the surface.