Exactly that: leagues. There is the AFL (Australian Football
League), and some lower level leagues: SANFL (South Australian
National Football League), WAFL (West Australian Football League),
VFL (Victorian Football League), etc.
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The AFL is the Australian Football League (a soccer league like
the MLS in the US or UEFA in Europe)
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West Australian Football League was created in 1885.
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Ontario Australian Football League was created in 1989.