Updated production rules:
rule_15: A7 -> 6 1
rule_22: A10 -> 20 2 1
rule_40: A21 -> 18 19 8 1 13 12
rule_55: A29 -> 1 22 A33 23
rule_59: A31 -> 5 1 14 15 21
rule_77: A42 -> A40 29 26
rule_81: A45 -> A9 1 16 17