irre[4], reit[4], riet[4], rite[4], tier[4], irrt[4], etui[4], reut[4], rute[4], treu[4],
ire[3], irr[3], reu[3], ure[3], tue[3],
ei[2], er[2], re[2], et[2], ti[2], ui[2], ur[2], tu[2],