obco[7], boni[6], niob[6], oboi[6], bono[6], obon[6], nico[5],
cob[6], bin[5], ibn[5], boi[5], obi[5], bon[5], cni[4], nic[4], noc[4], ino[3], oni[3], ono[3],
bi[4], bo[4], ci[3], co[3], in[2], ni[2], no[2], on[2],
