Assertion: american football | /r/CapableOf | know as gridiron
Facets:
Source sentences:
text: American football (referred to as football in the United States and also known as gridiron) is a sport played by two teams of eleven players on a rectangular field with goalposts at each end.
text: American football, referred to as football in the United States and Canada and also known as gridiron, is a team sport played by two teams of eleven players on a rectangular field with goalposts at each end.