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Harley collects sports cards. He has 810 football cards and 144 baseball cards. Harley plans to arrange his cards in stacks so that each stack has the same number of cards.​ Also, each stack must have the same type of card​ (football or​ baseball). Every card in​ Harley's collection is to be placed in one of the stacks. What is the largest number of cards that can be placed in each​ stack?