Assertion: pitcher's ball | /r/HasProperty | 10 players
Facets:
value: on the field
type: LOCATION
value: at once
type: TEMPORAL
Source sentences:
text: In the most common type, slow-pitch softball, the ball, which can measure either 11 inches, for a women's league, or 12 inches, for a men's league, in circumference, must arch on its path to the batter, and there are 10 players on the field at once.