Updated production rules:
rule_2: A2 -> 20 A5 A4
rule_19: A17 -> 1 A12 A19
rule_21: A19 -> 12 30 31 29
rule_22: A20 -> 5 33 4 A13 A21
rule_23: A21 -> 18 2 32
rule_24: A22 -> 1 A11 A23
rule_42: A34 -> 3 21 36 20
rule_49: A39 -> 13 21 37 20
rule_53: A42 -> 14 30 38 29