VALUE::	 i VALETY.
VALETY:: VALUE; EMPTY.
EMPTY::	 .

program:
   expression value VALUE, equals symbol, expression value VALUE.

expression value VALUE:
   primary value VALUE.

expression value VALUE1 VALUE2:
   primary value VALUE1, plus symbol, primary value VALUE2.

primary value VALUE:
   constant value VALUE.

{  lpar symbol, expression value VALUE, rpar symbol. }

{ constant value EMPTY:
   zero symbol. }

constant value VALUE:
   VALUE eyes.

i eyes:
   i symbol.

i VALUE eyes:
   i eyes, VALUE eyes.

equals symbol:	'='.
plus symbol:	'+'.
times symbol:	'*'.
lpar symbol:	'('.
rpar symbol:	')'.
i symbol:	'i'.