bido[7], obco[7], dobo[7], diod[6], codo[6], dodo[6], oboi[6], ooid[5],
bid[6], cob[6], bod[6], cod[5], doc[5], boi[5], obi[5], doi[4], ido[4], odo[4],
bi[4], bo[4], ci[3], id[3], co[3], do[3], od[3],
