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GetQuantityOfItemInBag:
; In: b = item ID
; Out: b = how many of that item are in the bag
call GetPredefRegisters
ld hl, wNumBagItems
.loop
inc hl
ld a, [hli]
cp $ff
jr z, .notInBag
cp b
jr nz, .loop
ld a, [hl]
ld b, a
ret
.notInBag
ld b, 0
ret
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