This program illustrates typical uses of the default list class iterator
(which is a random access iterator), and also shows the use of operators
-> and  == with list class iterators.
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Here are the values in our list:
1 2 4 8 16 32 64
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p1 is set to point at the first component and p2 to one-past the last.
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p1 and p2 point to different list elements.
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Locations (accessed with the -> operator): (1, 2) (4, 5)
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