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When there is no break or return statement to terminate the
execution of a sequence of statements, execution is said to fall through to the next sequence of
statements, where execution continues, once again, in search of a
break or return statement.
The reason for the fall-through feature is that you occasionally want to perform the same action in response to any of several conditions.
Note carefully, however, that inadvertently forgetting a break or
return statement is a common error.