Updated production rules:
rule_6: A5 -> 10 2 9 1
rule_13: A10 -> 6 19 20 18
rule_16: A13 -> 36 27 22
rule_24: A20 -> 7 28 29 27
rule_28: A23 -> 12 2 30 1
rule_35: A28 -> 8 2 31 1
rule_47: A37 -> 16 19 34 18