Route #1: 75 68 2 74 28 62 73 1 43 41 42 64 22 61 21 48 30 4 
Route #2: 67 46 8 19 54 13 57 15 37 20 70 60 71 69 36 47 5 29 45 27 52 34 
Route #3: 51 16 3 44 32 9 39 31 55 25 50 18 24 49 56 23 63 33 6 
Route #4: 26 7 35 53 14 59 66 11 65 38 10 58 72 12 40 17 
cost 593