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enum invobject {
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INVITEM_BLANK = 0, // must always be 0
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INVITEM_POPCORN,
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INVITEM_PAGER,
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};
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extern int inventory[INVENTORY_SIZE];
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int count_item_in_inventory(int item);
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int add_to_inventory(int item); // returns slot number or -1 if no space available
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