Updated production rules:
rule_8: A3 -> 8 1 3 A4
rule_40: A20 -> A25 21 A21 20 19
rule_50: A26 -> A11 1 10 11
rule_55: A28 -> 28 27 A34 A29 26 22
rule_68: A35 -> A16 1 17 18
rule_87: A44 -> 25 1 33 A45 34
rule_93: A48 -> A6 A39 30 36 35