Assertion: cello's string | /r/HasProperty | added in case
Facets:
Source sentences:
text: The "Viennese tuning" (A 1 –D 2 –F♯ 2 –A 2 ) was popular, and in some cases a fifth string or even sixth string was added (F 1 –A 1 –D 2 –F♯ 2 –A 2 ).