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If again

$\begin{program} Statement~\=::=~\=IF~IDENT~Statement~ \\ ~~~~~~~~~~~~~~\\ gt$\ve... ...~~~\\ gt$\vert$\\ gt RETURN~NUMLIT~SEMI \\ ~~~~~~~~~~~~~~~~~~\\ gt;\end{program}$
reports a shift-reduce conflict. Why?
$\begin{program} {\vem if}~x~{\vem if}~y~{\vem return}~3;~{\vem else}~{\vem return}~7;\end{program}$

Christoph Zenger
4/6/2000