boru[8], buro[8], brus[8], burs[8], suro[6],
obu[7], bru[7], bur[7], bus[7], bor[5], rob[5], oru[5], sou[5], rus[5], sur[5], ros[3],
bu[6], bo[4], su[4], or[2], ro[2], os[2],
