254 appears in 4 rows, but likewise, 238, 247 and 253 each appear in 3 rows.
How to account for this? Why not return a table with 5 rows—why only 2?
Why and how is a match among 4 rows to be preferred to one or more matches among a smaller subset of the same rows?
And then, how about overlapping sets of matches (rather than subsets)? For example if there is a 4-way match between rows A, B, C, D and a different 4-way match between rows A, B, F and P. Or a 5-way match among a different set of rows including B and D.