Assertion: zither's string | /r/HasProperty | tuned in unison
Facets:
Source sentences:
text: Over each bridge cross four strings tuned in unison, spanning horizontally across the right and left side of the instrument.
text: The steel treble strings are arranged in groups of 4 and are tuned in unison.
text: The bass strings which are over-spun with copper, are arranged in groups of 3 and are also tuned in unison.