berek[8], rebek[8], berki[8], biker[8], breki[8], erbie[7],
beki[7], brek[7], rebe[6], brei[6], brie[6], erek[5], erki[5], kier[5], reki[5],
bek[6], bee[5], ber[5], erb[5], reb[5], kei[4], kie[4], ker[4], rek[4], ikr[4], kir[4], rei[3],
be[4], bi[4], ki[3], ee[2], er[2], re[2],
