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You know that nextToken returns the value of
the TT_EOF instance variable when there are no more tokens.
In the event that there is a token, the value returned by nextToken
depends on whether the token is a number or a string. If the token is a
number, nextToken returns the value of the
TT_NUMBER
instance variable; if the token is a string, nextToken returns the
value of the
TT_WORD instance variable.