25 \item \texttt{"if33 ifif then then23 else else 32"}

    25 \item \texttt{"if33 ifif then then23 else else 32"}

    26 \item \texttt{"if x4x < 33 then 1 else 3"}

    26 \item \texttt{"if x4x < 33 then 1 else 3"}

    27 \end{enumerate}

    27 \end{enumerate}

    28 

    28 

    29 In case they can, give the corresponding token sequences. (Hint: 

    29 In case they can, give the corresponding token sequences. (Hint: 

    31 expressions that make the process of lexing unambiguous.)

    31 expressions that make the process of lexing unambiguous.)

    32 

    32 

    33 \item Suppose the grammar

    33 \item Suppose the grammar

    34 

    34 

    35 \begin{center}

    35 \begin{center}