Updated production rules:
rule_9: A6 -> 9 16 15 14 13 12 11 10
rule_10: A7 -> 17 24 23 22 21 20 19 18
rule_12: A9 -> 33 40 39 38 37 36 35 34
rule_14: A11 -> 41 48 47 46 45 44 43 42
rule_15: A12 -> 49 8 7 6 5 4 3 2
rule_16: A13 -> 50 32 31 30 29 28 27 26