-ic bbb bbc bbd bbi bbk bbo bby bcb bcc bcd bci bck bco bcy bdb bdc bdd bdi bdk bdo bdy bi- bib bic bid bii bik bio biy bkb bkc bkk bko bob boc bod boi bok boo boy by- byc byd byi byk byo c-- cbb cbc cbd cbi cbk cbo cby ccb ccc ccd cci cck cco cdb cdc cdd cdi cdk cdo cdy ci- cib cic cid cii cik cio ckb ckc ckd cki cko cky co- cob coc cod coi cok coo coy cyb cyc cyd cyk cyo dbb dbc dbd dbi dbk dbo dby dcb dcc dcd dci dck dco ddb ddc ddd ddi ddk ddo ddy di- dib dic did dii dik dio diy dkb dkc dki dkk dko dob doc dod doi dok doo doy dy- dyb dyc dyd dyk dyo dyy i-d ibb ibc ibd ibi ibk ibo iby icb icc icd ici ick ico icy idb idc idd idi idk ido idy iib iic iid iii iio ikb ikc iki ikk iko io- iob ioc iod ioi ioo iyc iyo iyy kbb kbc kbd kbi kbk kbo kcb kcc kcd kci kck kdb kdc kdk kdo kdy kib kic kid kii kik kio kkb kkc kki kkk kky kob koc kod koi kok koo koy kyc kyd kyo o-i ob- obb obc obd obi obk obo oby oc- ocb occ ocd oci ock oco odb odc odd odi odo oib oic oid oii oik oio okb okc okd oki okk oko oo- oob ooc ood ooi ook ooo oyd oyi oyo ybc ybi yby ycc ycd yci yco ycy ydo ydy yid yii yio yki ykk yob yoc yod yoi yok yoo yoy yyb yyc yyy