De Josselin de Jong (1926) cites the following forms of the 3PL pronoun/nominal plural marker, which appear to be all allomorphs of the same morpheme: sendr, senr, sinr, sen@, sin@, seni, sini, sinu, zin@, si, se & sa.
Source: Josselin de Jong 1926: 16
Source: Josselin de Jong 1926: 59