Updated production rules:
rule_68: A37 -> 9 A40 8
rule_79: A41 -> 14 9 A40 8 6
rule_81: A42 -> 29 3 A44 2
rule_91: A44 -> 16 9 A43 8
rule_95: A47 -> 1 17
rule_154: A68 -> A37 18
rule_234: A107 -> A37 20