beru[8], bure[8], erbu[8], boru[8], buro[8], rebe[6], bero[6], ober[6], euro[6], ruro[6], oere[4],
obu[7], bru[7], bur[7], bee[5], ber[5], erb[5], reb[5], bor[5], rob[5], brr[5], oru[5], rur[5], ero[3],
bu[6], be[4], bo[4], ee[2], eo[2], er[2], re[2], or[2], ro[2],
