8 reserved words if, then, else, write, read, end, repeat, until
ASSIGN EQ LT PLUS MINUS TIMES OVER LPAREN RPAREN SEMI
6 reserved words if, else, int, void, while, return
ASSIGN EQ NEQ LT LET GT GET PLUS MINUS TIMES OVER COMMA LPAREN RPAREN LBRACKET RBRACKET LBRACE RBRACE SEMI