bbb bbd bbi bbk bbo bby bdb bdd bdi bdk bdo bdy bi- bib bid bii bik bio biy bkb bkk bko bob bod boi bok boo boy by- byd byi byk byo dbb dbd dbi dbk dbo dby ddb ddd ddi ddk ddo ddy di- dib did dii dik dio diy dkb dki dkk dko dob dod doi dok doo doy dy- dyb dyd dyk dyo dyy i-d ibb ibd ibi ibk ibo iby idb idd idi idk ido idy iib iid iii iio ikb iki ikk iko io- iob iod ioi ioo iyo iyy kbb kbd kbi kbk kbo kdb kdk kdo kdy kib kid kii kik kio kkb kki kkk kky kob kod koi kok koo koy kyd kyo o-i ob- obb obd obi obk obo oby odb odd odi odo oib oid oii oik oio okb okd oki okk oko oo- oob ood ooi ook ooo oyd oyi oyo ybi yby ydo ydy yid yii yio yki ykk yob yod yoi yok yoo yoy yyb yyy