第一题：The set of all strings consisting of an uppercase letter followed by zero or more
additional characters, each of which is either an uppercase letter or one of the digits
0 through 5.
第二题：The set of all strings consisting of the keyword begin, followed by one or more
statements with a semicolon after each one, followed by the keyword end.
Note: Use the non-terminal for a single statement. You are not
required to give productions for it.
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