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There are a number of varieties of the "drop" action. They all discard one or more items from the top of the stack. So: if the stack contains
1 2 "three" 4
then calling "drop" throws away the last item, so that it now contains..
1 2 "three"
drop drops one item drop2: drops two items drop3: drops three items drop4: drops four items dropall: drops all items (empties the stack)
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