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NOTE: Each of
the big blocks is a struct (or class) that has
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a pointer to
another one. Remember that the pointer only
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stores the memory
location of something, it is not that
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thing, so the
arrow goes to the next one. At the end, there
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is nothing for
the pointer to point to, so it does not point to
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anything, it
should be set to "NULL" to prevent it from
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accidentally
pointing to a totally arbitrary and random
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location in memory (which
is very bad).
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