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Replace ( stack , item 1 , item 2 ) Pop ( stack , item ) WHILE ( Item ! = item 1 ) Pop

Replace(stack, item1, item2)
Pop(stack, item)
WHILE(Item != item1)
Pop(stack, item)
If(NOT Empty(Stack))
Push(newStack, item2)
WHILE(NOT Empty(newStack))
Pop(newStack, item)
Push(stack, item)

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