biuro[9], urobi[9],
uboi[8], biur[8], boru[8], buro[8], oboi[6], brio[6], broi[6], robi[6], boro[6], robo[6], uroi[6],
obu[7], bru[7], bur[7], boi[5], obi[5], bor[5], rob[5], rui[5], oru[5], roi[3], oro[3],
bu[6], bi[4], bo[4], ii[2], or[2], ro[2],
