furek[12], kufer[12], kurek[9], eurek[8],
refu[10], fere[8], free[8], keku[8], kruk[8], keru[7], reku[7], erek[5],
kuf[10], fru[9], fur[9], ruf[9], fee[7], ref[7], kuk[7], kur[6], kek[5], ker[4], rek[4],
fu[8], uf[8], ef[6], fe[6], ku[5], ee[2], er[2], re[2],
