cent[6], cetn[6], kent[6], cert[6], kret[6], trek[6], rent[5], tern[5], tren[5],
cek[5], ket[5], tek[5], cen[4], cne[4], cer[4], ker[4], rek[4], net[4], ten[4], ret[4], ter[4], ner[3], ren[3],
ce[3], et[3], te[3], en[2], er[2], re[2],
