1? DIMENSION 2 ( 3+ , 3 %bound 4 ) 5 %bound: 6? 6 %lower-bound 6.1 -: 6 *: 7 %upper-bound 7 * lower-bound: 1! 1 1? 1 expression 1.1? REFER(variable) upper-bound: 1 expression 2? REFER(variable)