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rugby × 33rules × 11
rugby-union × 9
rugby-league × 6
football × 4
history × 4
american-football × 3
australian-rules-football × 3
officiating × 2
equipment × 2
terminology × 1
olympics × 1
international-sports × 1
tactics × 1
venues × 1
doping × 1
fans × 1
promotions × 1
relegations × 1
kicking × 1
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