Need help with find similar records

hi,

i have a model like this capturing integer values.

testrun_id
valve_a
valve_b
valve_c
valve_…n

what i would like to know is how to write an ar-query to find similar
records across all valve-values. similar to levenshtein distance, but
for
integers. i could imagine also grouping some valves-values into a total
and
compare the totals, but not sure.
any ideas?

thx