Very good methods mentioned here. Your following pairs remind me of Ladyc's system she has going on with her 89 01 system.
Followers. That's a whole other thread now, isn't it? I do that sometimes...search 2 pairs together and see which 2 come out the most.
Just now I searched 869 with 12, 13 and 15 individually.
869 and 12--1155 times
869 and 13--1140 times
869 and 15--1152 times.
It's interesting if we just search the 86 pair with the 12.
The numbers jump up.
86 and 12--2074 times
86 and 13--2059 times
86 and 15--2071 times
Of course you could try searching every single pair together and see what 2 come out most. It's a project that may take a little time but may be worth it in the end.
Here is a chart I made up awhile ago if you are so inclined to do so.
Search 00 with 01, 00 with 02, and so on. Print this out if you wish. I purposely left out all doubles since,guess what,they don't show nearly as often as single unmatched digits.
00 with
01 02 03 04 05 06 07 08 09 12 13 14 15 16 17 18 19 23 24 25 26 27 28 29 34 35 36 37 38 39 45 46 47 48 49 56 57 58 59 67 68 69 78 79 89
01 with
02 03 04 05 06 07 08 09 12 13 14 15 16 17 18 19 23 24 25 26 27 28 29 34 35 36 37 38 39 45 46 47 48 49 56 57 58 59 67 68 69 78 79 89
02 with
03 04 05 06 07 08 09 12 13 14 15 16 17 18 19 23 24 25 26 27 28 29 34 35 36 37 38 39 45 46 47 48 49 56 57 58 59 67 68 69 78 79 89
03 with
04 05 06 07 08 09 12 13 14 15 16 17 18 19 23 24 25 26 27 28 29 34 35 36 37 38 39 45 46 47 48 49 56 57 58 59 67 68 69 78 79 89
04 with
05 06 07 08 09 12 13 14 15 16 17 18 19 23 24 25 26 27 28 29 34 35 36 37 38 39 45 46 47 48 49 56 57 58 59 67 68 69 78 79 89
05 with
06 07 08 09 12 13 14 15 16 17 18 19 23 24 25 26 27 28 29 34 35 36 37 38 39 45 46 47 48 49 56 57 58 59 67 68 69 78 79 89
06 with
07 08 09 12 13 14 15 16 17 18 19 23 24 25 26 27 28 29 34 35 36 37 38 39 45 46 47 48 49 56 57 58 59 67 68 69 78 79 89
07 with
08 09 12 13 14 15 16 17 18 19 23 24 25 26 27 28 29 34 35 36 37 38 39 45 46 47 48 49 56 57 58 59 67 68 69 78 79 89
08 with
09 12 13 14 15 16 17 18 19 23 24 25 26 27 28 29 34 35 36 37 38 39 45 46 47 48 49 56 57 58 59 67 68 69 78 79 89
09 with
12 13 14 15 16 17 18 19 23 24 25 26 27 28 29 34 35 36 37 38 39 45 46 47 48 49 56 57 58 59 67 68 69 78 79 89
12 with
13 14 15 16 17 18 19 23 24 25 26 27 28 29 34 35 36 37 38 39 45 46 47 48 49 56 57 58 59 67 68 69 78 79 89
13 with
14 15 16 17 18 19 23 24 25 26 27 28 29 34 35 36 37 38 39 45 46 47 48 49 56 57 58 59 67 68 69 78 79 89
14 with
15 16 17 18 19 23 24 25 26 27 28 29 34 35 36 37 38 39 45 46 47 48 49 56 57 58 59 67 68 69 78 79 89
15 with
16 17 18 19 23 24 25 26 27 28 29 34 35 36 37 38 39 45 46 47 48 49 56 57 58 59 67 68 69 78 79 89
16 with
17 18 19 23 24 25 26 27 28 29 34 35 36 37 38 39 45 46 47 48 49 56 57 58 59 67 68 69 78 79 89
17 with
18 19 23 24 25 26 27 28 29 34 35 36 37 38 39 45 46 47 48 49 56 57 58 59 67 68 69 78 79 89
18 with
19 23 24 25 26 27 28 29 34 35 36 37 38 39 45 46 47 48 49 56 57 58 59 67 68 69 78 79 89
19 with
23 24 25 26 27 28 29 34 35 36 37 38 39 45 46 47 48 49 56 57 58 59 67 68 69 78 79 89
23 with
24 25 26 27 28 29 34 35 36 37 38 39 45 46 47 48 49 56 57 58 59 67 68 69 78 79 89
24 with
25 26 27 28 29 34 35 36 37 38 39 45 46 47 48 49 56 57 58 59 67 68 69 78 79 89
25 =with
26 27 28 29 34 35 36 37 38 39 45 46 47 48 49 56 57 58 59 67 68 69 78 79 89
26 with
27 28 29 34 35 36 37 38 39 45 46 47 48 49 56 57 58 59 67 68 69 78 79 89
27 with
28 29 34 35 36 37 38 39 45 46 47 48 49 56 57 58 59 67 68 69 78 79 89
28 with
29 34 35 36 37 38 39 45 46 47 48 49 56 57 58 59 67 68 69 78 79 89
29 with
34 35 36 37 38 39 45 46 47 48 49 56 57 58 59 67 68 69 78 79 89
34 with
35 36 37 38 39 45 46 47 48 49 56 57 58 59 67 68 69 78 79 89
35 with
36 37 38 39 45 46 47 48 49 56 57 58 59 67 68 69 78 79 89
36 with
37 38 39 45 46 47 48 49 56 57 58 59 67 68 69 78 79 89
37 with
38 39 45 46 47 48 49 56 57 58 59 67 68 69 78 79 89
38 with
39 45 46 47 48 49 56 57 58 59 67 68 69 78 79 89
39 with
45 46 47 48 49 56 57 58 59 67 68 69 78 79 89
45 with
46 47 48 49 56 57 58 59 67 68 69 78 79 89
46 with
47 48 49 56 57 58 59 67 68 69 78 79 89
47 with
48 49 56 57 58 59 67 68 69 78 79 89
48 with
49 56 57 58 59 67 68 69 78 79 89
49 with
56 57 58 59 67 68 69 78 79 89
56 with
57 58 59 67 68 69 78 79 89
57 with
58 59 67 68 69 78 79 89
58 with
59 67 68 69 78 79 89
59 with
67 68 69 78 79 89
67 =with
68 69 78 79 89
68 with
69 78 79 89
69 with
78 79 89
78 with
79 89
79 with
89