1 INITIAL ( 2+ , 2 %item 3 ) 4 %item: 5* 5 %initial-constant 5 reference 5 (expression) 5 %iteration-specification iteration-specification: 1 ( 2 iteration-factor 2 * 3 ) 4 %iteration-item iteration-item: 1* 1 %initial-constant 1 reference 1 ( 1.1+ , 1.1 item 1.2 ) initial-constant: 1.0? 1.0 + 1.0 - 1.1 arithmetic-constant 1 bit-constant 1 character-constant 1 graphic-constant 1 entry-constant 1 file-constant 1 label-constant 1.0? 1.0 + 1.0 - 1.1 real-constant 1.2 + 1.2 - 1.3 imaginary-constant