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For Wisconsin's WIAA:
REQUIRED NUMBER OF OFFICIALS
(1) Four WIAA licensed officials are required for all varsity interscholastic competition.
(2) Four WIAA licensed officials are recommended for all nonvarsity contests, but only three are required.
NOTE: Five WIAA licensed officials will be used in all playoff games.
That being said, I've never seen a varsity game w/ only 4, but I'm sure it's happened.
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