The conversion files have 3 sets of precincts, rg, rr, and ss (same as sr). The rr precincts will have a one to many relationship to the conversion file as it stands, since there is a record for each rg precinct. The sov data will have a one to many relationship with the rrprecincts as well. There may also be precincts in the conversion file that do not appear in the sov data. For example, San Bernardino has large unpopulated areas which are precincted.