Assertion: vertebra's facet joint | /r/HasProperty | one pair
Facets:
Source sentences:
text: Each vertebra has four facet joints, one pair that connects to the vertebra above (superior facets) and one pair that connects to the vertebra below (inferior facets) (Fig. 6).
text: Each vertebra has two facet joints, one pair that connects to the vertebra above (superior facets) and one pair that connects to the vertebra below (inferior facets).