-ic bbb bbc bbh bbi bbk bbo bbs bcb bcc bch bci bck bco bcs bhb bhc bhh bhi bhk bho bhs bi- bib bic bih bii bik bio bis bkb bkc bkk bko bks bob boc boh boi bok boo bos bsb bsc bsh bsi bsk bso bss c-- cbb cbc cbh cbi cbk cbo cbs ccb ccc cch cci cck cco ccs ch- chb chc chh chi chk cho chs ci- cib cic cih cii cik cio cis ckb ckc ckh cki cko cks co- cob coc coh coi cok coo cos csb csc csh csi csk cso css h-i hbb hbc hbh hbi hbk hbo hbs hcb hcc hch hci hck hco hcs hhb hhc hhh hhi hhk hho hhs hib hic hih hii hik hio his hkb hkh hki hkk hko hks hob hoc hoh hoi hok hoo hos hsb hsc hsh hsi hsk hss ibb ibc ibh ibi ibk ibo ibs icb icc ich ici ick ico ics ihb ihc ihh ihi ihk iho ihs iib iic iih iii iio iis ikb ikc iki ikk iko iks io- iob ioc ioh ioi ioo ios is- isb isc ish isi isk iso iss kbb kbc kbh kbi kbk kbo kbs kcb kcc kch kci kck kcs khh khi khk kho khs kib kic kih kii kik kio kis kkb kkc kkh kki kkk kks kob koc koh koi kok koo kos ksb ksc ksh ksi ksk kso kss o-i ob- obb obc obh obi obk obo obs oc- ocb occ och oci ock oco ocs ohc ohh ohi oho ohs oib oic oii oik oio ois okb okc oki okk oko oks oo- oob ooc ooh ooi ook ooo oos os- osb osc osh osi osk oso oss sbb sbc sbh sbi sbk sbo sbs scb scc sch sci sck sco scs sh- shb shc shh shi shk sho shs sib sic sih sii sik sio sis sk- skb skc skh ski skk sko sks sob soc soh soi sok soo sos ss- ssb ssc ssh ssi ssk sso sss