/media/sda-magnetic/david/Dok-15-2023-11-27/fernuni-hagen/cs-i-ii/old-cs-2-03/bash-programming/lex-yacc-bash-etc/grammatik08.txt

statement -> assignment | cond | loop
assignment -> id := expr
cond -> if boolexpr then statement fi
        | if boolexpr then statement else statement fi
loop -> while boolexpr do statement od
expr -> boolexpr | numexpr
boolexpr -> numexpr cop numexpr
numexpr -> numexpr + term | term
term -> term * factor | factor 
factor -> id | const | (numexpr)