berd[7], debr[7], dedr[6], dred[6], rebe[6], eden[5], dren[5], nerd[5],
bee[5], ben[5], ber[5], erb[5], reb[5], den[4], end[4], der[4], red[4], ner[3], ren[3],
be[4], de[3], ee[2], en[2], er[2], re[2],
