Updated production rules:
rule_4: A4 -> A7 7 A11
rule_52: A18 -> 7 A20 6 A9 A19
rule_56: A22 -> 5 A24 9 2 A10 A23
rule_60: A26 -> 19 A28 A12 22 17 A27
rule_64: A30 -> 14 3 A32 A8 10 A31
rule_68: A34 -> A36 20 18 A17 A35
rule_72: A38 -> 24 16 A40 A12 16 A39