bobu[10], boru[8], buro[8], rowu[6], woru[6],
bub[9], buc[8], bob[7], obu[7], bru[7], bur[7], cob[6], cru[6], bor[5], rob[5], oru[5], rwo[3],
bu[6], bo[4], wu[4], co[3], or[2], ro[2],
