L-6, r. 5 - Bingo Rules

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102. After a player has been declared a winner, the bingo caller must ask players if there are other winners. If no other player claims to have won, the bingo game is declared closed; if other players claim to have won, the game is declared closed once the numbers on the cards of all players claiming to be winners have been verified.
A player may not claim to be a winner once the bingo caller has declared a bingo game closed.
O.C. 1108-2007, s. 102.