perl[8], bels[7], pers[7], reps[7], derb[6],
bel[6], leb[6], per[6], rep[6], pes[6], erb[5], les[4], der[3], erd[3], red[3], des[3], ers[3], res[3], ess[3],
er[2], re[2], es[2],
