berek[8], rebek[8], perek[7],
brek[7], rebe[6], krep[6], erek[5],
bek[6], bee[5], ber[5], erb[5], reb[5], ker[4], rek[4], per[4], rep[4],
be[4], pe[3], ee[2], er[2], re[2],
