Assertion: american football | /r/CapableOf | know as gridiron,[nb 1
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Source sentences:
text: American football, referred to as football in the United States and Canada and also known as gridiron,[nb 1] is a team 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,[nb 1] is a team sport.
text: American football, referred to as football in the United States and Canada and also known as gridiron,[nb 1] is a team sport.