-ic bbb bbc bbd bbi bbk bbo bbs bby bcb bcc bcd bci bck bco bcs bcy bdb bdc bdd bdi bdk bdo bds bdy bi- bib bic bid bii bik bio bis biy bkb bkc bkk bko bks bob boc bod boi bok boo bos boy bsb bsc bsd bsi bsk bso bss bsy by- byc byd byi byk byo bys c-- cbb cbc cbd cbi cbk cbo cbs cby ccb ccc ccd cci cck cco ccs cdb cdc cdd cdi cdk cdo cds cdy ci- cib cic cid cii cik cio cis ckb ckc ckd cki cko cks cky co- cob coc cod coi cok coo cos coy csb csc csd csi csk cso css csy cyb cyc cyd cyk cyo cys dbb dbc dbd dbi dbk dbo dbs dby dcb dcc dcd dci dck dco dcs ddb ddc ddd ddi ddk ddo dds ddy di- dib dic did dii dik dio dis diy dkb dkc dki dkk dko dks dob doc dod doi dok doo dos doy dsb dsc dsd dsi dsk dso dss dsy dy- dyb dyc dyd dyk dyo dys dyy i-d ibb ibc ibd ibi ibk ibo ibs iby icb icc icd ici ick ico ics icy idb idc idd idi idk ido ids idy iib iic iid iii iio iis ikb ikc iki ikk iko iks io- iob ioc iod ioi ioo ios is- isb isc isd isi isk iso iss isy iyc iyo iys iyy kbb kbc kbd kbi kbk kbo kbs kcb kcc kcd kci kck kcs kdb kdc kdk kdo kds kdy kib kic kid kii kik kio kis kkb kkc kki kkk kks kky kob koc kod koi kok koo kos koy ksb ksc ksd ksi ksk kso kss kyc kyd kyo kys o-i ob- obb obc obd obi obk obo obs oby oc- ocb occ ocd oci ock oco ocs odb odc odd odi odo ods oib oic oid oii oik oio ois okb okc okd oki okk oko oks oo- oob ooc ood ooi ook ooo oos os- osb osc osd osi osk oso oss oyd oyi oyo oys sbb sbc sbd sbi sbk sbo sbs sby scb scc scd sci sck sco scs sdb sdc sdd sdi sdk sdo sds sdy sib sic sid sii sik sio sis sk- skb skc skd ski skk sko sks sky sob soc sod soi sok soo sos soy ss- ssb ssc ssd ssi ssk sso sss sy- syb syc syd syi syk sys ybc ybi ybs yby ycc ycd yci yco ycs ycy ydo yds ydy yid yii yio yis yki ykk yob yoc yod yoi yok yoo yos yoy ysb ysc ysi ysk yso yss ysy yyb yyc yys yyy