Use the braces described in Question $4.2.4$ to simplify the following grammar for statement blocks and conditional statements:
$stmt\rightarrow if\: expr\:then\:stmt\:else\:stmt$
$\mid if \: stmt \: then \: stmt$
$\mid begin\: stmtList\: end$
$stmtList\rightarrow stmt;stmtList\mid stmt$