sfer[8], krep[6], keks[6], kres[5], kser[5], reks[5], pers[5],
pfe[8], ref[7], fes[7], kek[5], ker[4], rek[4], per[4], rep[4], eks[4], sep[4], ser[3],
ef[6], fe[6], pe[3], er[2], re[2], es[2], se[2],
