Updated production rules:
rule_7: A6 -> 9 16 15 14 13 12 11 10
rule_8: A7 -> 17 24 23 22 21 20 19 18
rule_9: A8 -> 32 39 38 37 36 35 34 33
rule_12: A11 -> 48 8 7 6 5 4 3 2
rule_14: A13 -> 49 31 30 29 28 27 26 25