berd[7], debr[7], bert[7], terb[7], cedr[6], cred[6], cent[6], cetn[6], cert[6], nett[6], tent[6], tetr[6], tret[6], dren[5], nerd[5], rent[5], tern[5], tren[5],
bet[6], ben[5], ber[5], erb[5], reb[5], edt[5], cen[4], cne[4], den[4], end[4], cer[4], der[4], red[4], net[4], ten[4], ret[4], ter[4], ner[3], ren[3],
be[4], ce[3], de[3], et[3], te[3], en[2], er[2], re[2],
