oboi[6], brio[6], broi[6], robi[6], boro[6], robo[6], poro[5], ropo[5],
boi[5], obi[5], bor[5], rob[5], poi[4], por[4], pro[4], rop[4], iii[3], roi[3], oro[3],
bi[4], bo[4], pi[3], op[3], po[3], ii[2], or[2], ro[2],
