P.S. I am looking at these as matching ex. 34 + 88 --> 3488, 34 +38 --> 3438 or 57 + 34 --> 5437, 37 + 34 --> 3734 etc.. These combos have produced a few hits since posted.
A lot of combinations, but looking at the different combos and comparing to other posts as well. Note: 37 is part of a cuff triad. Would not expect the doubles to hit as often as single, so would look first at combos of singles ex 34+01 before looking at combos of 88 and all the numbers, unless you think a double might drop.
Sorry, have have not had a chance to update the list of pairs and triads.