Assertion: flute | /r/MadeOf | bone
Facets:
Source sentences:
text: The flutes, made of bone and ivory, represent the earliest known musical instruments and provide unmistakable evidence of prehistoric music.
text: Archaeologists in the Jiahu site of central Henan province of China have found flutes made of bones that date back 7,000 to 9,000 years, representing some of the "earliest complete, playable, tightly-dated, multinote musical instruments" ever found.