bbb bbd bbi bbk bbo bdb bdd bdi bdk bdo bi- bib bid bii bik bio bkb bkk bko bob bod boi bok boo dbb dbd dbi dbk dbo ddb ddd ddi ddk ddo di- dib did dii dik dio dkb dki dkk dko dob dod doi dok doo i-d ibb ibd ibi ibk ibo idb idd idi idk ido iib iid iii iio ikb iki ikk iko io- iob iod ioi ioo kbb kbd kbi kbk kbo kdb kdk kdo kib kid kii kik kio kkb kki kkk kob kod koi kok koo o-i ob- obb obd obi obk obo odb odd odi odo oib oid oii oik oio okb okd oki okk oko oo- oob ood ooi ook ooo