Generate how many keys?
 3  4  5 11 28 + 8 9
 2  4 14 29 31 + 8 9
19 22 27 28 45 + 2 4
13 14 27 38 45 + 2 8
 2  4 15 32 47 + 1 4
 1  2 16 19 45 + 1 6
 5  7 21 23 45 + 1 9
 4  8 26 33 39 + 1 7
12 14 17 27 43 + 4 8
14 15 17 19 44 + 3 6