oporu[8],
boru[8], buro[8], poru[7], boro[6], robo[6], poro[5], ropo[5],
pub[8], obu[7], bru[7], bur[7], opu[6], bor[5], rob[5], oru[5], por[4], pro[4], rop[4], oro[3],
bu[6], bo[4], op[3], po[3], or[2], ro[2],
