Simplify the following BNF grammar using metasymbols:

if stmt if cond then stmt endif | if cond then then then cond stmt stmt stmt then else stmt endif else-if endif else-if else stmt | if cond | I if endif cond elsif else if stmt elsif cond then stmt else-if if stmt if cond then stmt endif | if cond then then then cond stmt stmt stmt then else stmt endif else-if endif else-if else stmt | if cond | I if endif cond elsif else if stmt elsif cond then stmt else-if