obie[6], brei[6], brie[6], bero[6], ober[6], brio[6], broi[6], robi[6], birr[6],
boi[5], obi[5], ber[5], erb[5], reb[5], bor[5], rob[5], brr[5], rei[3], ero[3], roi[3],
be[4], bi[4], bo[4], eo[2], er[2], re[2], or[2], ro[2],
