expr				->	unaryOp
expr				->	binaryOp
expr				->	ternaryOp
expr				->	isolation
expr				->	NUMBER

unaryOp			->	55>-? expr

binaryOp			->	expr 60<^ expr
binaryOp			->	expr 50<* expr
binaryOp			->	expr 50</ expr
binaryOp			->	expr 40<+ expr
binaryOp			->	expr 40<- expr

ternaryOp		->	expr 90>? expr 90<: expr


isolation			->	( expr )



####################################


NUMBER is a terminal

40<+ expr means that token "+" is a left associative ( < ) operator of precedence 40

and 

55>-? expr means that token "-" is a right associative ( > ) operator of precedence 55 repeated at most once


10>? expr means that token "?" is a right associative ( > ) operator of precedence 10