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itempackethandler, player has to have # free slots


i need it to where if player has ALREADY opened (clicked) on 19650, (toolkit) that it wont let them.

i tired || player.getInventory().getFreeSlots() !=28) {

but it gives me a error saying this
';' expected

(i know you can't put a semi colon anywhere, it wouldn't work)

is there any better way from preventing the player from opening this item 2 times? or can someone help me with
|| player.getInventory().getFreeSlots() !=28) {


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