boni[6], niob[6], nipo[5], pion[5], inio[4],
bin[5], ibn[5], boi[5], obi[5], bon[5], nip[4], pin[4], pni[4], poi[4], ino[3], oni[3],
bi[4], bo[4], pi[3], op[3], po[3], ii[2], in[2], ni[2], no[2], on[2],
