-ic bbb bbc bbd bbh bbi bbk bbo bbr bbs bcb bcc bcd bch bci bck bco bcr bcs bdb bdc bdd bdh bdi bdk bdo bdr bds bhb bhc bhd bhh bhi bhk bho bhr bhs bi- bib bic bid bih bii bik bio bir bis bkb bkc bkk bko bkr bks bob boc bod boh boi bok boo bor bos brb brd brh bri brk bro brr brs bsb bsc bsd bsh bsi bsk bso bsr bss c-- cbb cbc cbd cbh cbi cbk cbo cbr cbs ccb ccc ccd cch cci cck cco ccr ccs cdb cdc cdd cdh cdi cdk cdo cdr cds ch- chb chc chd chh chi chk cho chr chs ci- cib cic cid cih cii cik cio cir cis ckb ckc ckd ckh cki cko cks co- cob coc cod coh coi cok coo cor cos crb crc crd crh cri crk cro crr crs csb csc csd csh csi csk cso csr css dbb dbc dbd dbh dbi dbk dbo dbr dbs dcb dcc dcd dci dck dco dcr dcs ddb ddc ddd ddh ddi ddk ddo ddr dds dh- dhb dhc dhd dhh dhi dhk dho dhr dhs di- dib dic did dih dii dik dio dir dis dkb dkc dki dkk dko dkr dks dob doc dod doh doi dok doo dor dos drb drc drd dri drk dro drr drs dsb dsc dsd dsh dsi dsk dso dsr dss h-i hbb hbc hbd hbh hbi hbk hbo hbr hbs hcb hcc hcd hch hci hck hco hcr hcs hdb hdc hdd hdh hdi hdk hdo hdr hds hhb hhc hhd hhh hhi hhk hho hhr hhs hib hic hid hih hii hik hio hir his hkb hkd hkh hki hkk hko hkr hks hob hoc hod hoh hoi hok hoo hor hos hr- hrb hrc hrd hrh hri hrk hro hrr hrs hsb hsc hsd hsh hsi hsk hsr hss i-d ibb ibc ibd ibh ibi ibk ibo ibr ibs icb icc icd ich ici ick ico icr ics idb idc idd idh idi idk ido idr ids ihb ihc ihd ihh ihi ihk iho ihr ihs iib iic iid iih iii iio iir iis ikb ikc iki ikk iko ikr iks io- iob ioc iod ioh ioi ioo ior ios ir- irb irc ird iri irk iro irr irs is- isb isc isd ish isi isk iso isr iss kbb kbc kbd kbh kbi kbk kbo kbr kbs kcb kcc kcd kch kci kck kcr kcs kdb kdc kdh kdk kdo kdr kds khh khi khk kho khr khs kib kic kid kih kii kik kio kir kis kkb kkc kkh kki kkk kkr kks kob koc kod koh koi kok koo kor kos krc krd kri krk kro krr krs ksb ksc ksd ksh ksi ksk kso ksr kss o-i ob- obb obc obd obh obi obk obo obr obs oc- ocb occ ocd och oci ock oco ocr ocs odb odc odd odh odi odo odr ods ohc ohd ohh ohi oho ohr ohs oib oic oid oii oik oio oir ois okb okc okd oki okk oko okr oks oo- oob ooc ood ooh ooi ook ooo oor oos or- orb orc ord orh ori ork oro orr ors os- osb osc osd osh osi osk oso osr oss rbb rbc rbd rbh rbi rbk rbo rbr rbs rcb rcc rcd rch rci rco rcr rcs rdb rdc rdd rdh rdi rdo rdr rds rh- rhb rhc rhd rhh rhi rho rhr rhs rib ric rid rih rii rik rio rir ris rkb rkc rkk rko rks rob roc rod roh roi rok roo ror ros rrb rrc rrd rrh rri rrk rrr rrs rsb rsc rsd rsh rsi rsk rso rsr rss sbb sbc sbd sbh sbi sbk sbo sbr sbs scb scc scd sch sci sck sco scr scs sdb sdc sdd sdh sdi sdk sdo sdr sds sh- shb shc shd shh shi shk sho shr shs sib sic sid sih sii sik sio sir sis sk- skb skc skd skh ski skk sko skr sks sob soc sod soh soi sok soo sor sos sr- srb src srd srh sri srk sro srr srs ss- ssb ssc ssd ssh ssi ssk sso ssr sss