Why is it only possible to pop one item at a time from a stack? Forklifts,

for example, can add, or remove multiple items from a stack. How do
the

rearrangements of data possible in this model compare to those possible

using only an ordinary stack? How should data be sorted using a single
data

structure of this type? We will discuss the answers to all these questions.

If you still think you might be bored, then be sure to bring along
coins of

five different denominations.