Assertion: frontal bone | /r/HasProperty | one of the principal
Facets:
Source sentences:
text: The frontal bone is one of the principal paired mid-line bones in dinosaur skulls.
text: The frontal bone is one of the principal paired mid-line bones in dinosaur skulls.
text: The frontal bone is one of the principal paired mid-line bones in dinosaur skulls.
text: The frontal bone is one of the principal paired mid-line bones in dinosaur skulls.
text: The frontal bone is one of the principal paired mid-line bones in dinosaur skulls.