-ic bbb bbc bbh bbi bbk bbo bbr bbs bcb bcc bch bci bck bco bcr bcs bhb bhc bhh bhi bhk bho bhr bhs bi- bib bic bih bii bik bio bir bis bkb bkc bkk bko bkr bks bob boc boh boi bok boo bor bos brb brh bri brk bro brr brs bsb bsc bsh bsi bsk bso bsr bss c-- cbb cbc cbh cbi cbk cbo cbr cbs ccb ccc cch cci cck cco ccr ccs ch- chb chc chh chi chk cho chr chs ci- cib cic cih cii cik cio cir cis ckb ckc ckh cki cko cks co- cob coc coh coi cok coo cor cos crb crc crh cri crk cro crr crs csb csc csh csi csk cso csr css h-i hbb hbc hbh hbi hbk hbo hbr hbs hcb hcc hch hci hck hco hcr hcs hhb hhc hhh hhi hhk hho hhr hhs hib hic hih hii hik hio hir his hkb hkh hki hkk hko hkr hks hob hoc hoh hoi hok hoo hor hos hr- hrb hrc hrh hri hrk hro hrr hrs hsb hsc hsh hsi hsk hsr hss ibb ibc ibh ibi ibk ibo ibr ibs icb icc ich ici ick ico icr ics ihb ihc ihh ihi ihk iho ihr ihs iib iic iih iii iio iir iis ikb ikc iki ikk iko ikr iks io- iob ioc ioh ioi ioo ior ios ir- irb irc iri irk iro irr irs is- isb isc ish isi isk iso isr iss kbb kbc kbh kbi kbk kbo kbr kbs kcb kcc kch kci kck kcr kcs khh khi khk kho khr khs kib kic kih kii kik kio kir kis kkb kkc kkh kki kkk kkr kks kob koc koh koi kok koo kor kos krc kri krk kro krr krs ksb ksc ksh ksi ksk kso ksr kss o-i ob- obb obc obh obi obk obo obr obs oc- ocb occ och oci ock oco ocr ocs ohc ohh ohi oho ohr ohs oib oic oii oik oio oir ois okb okc oki okk oko okr oks oo- oob ooc ooh ooi ook ooo oor oos or- orb orc orh ori ork oro orr ors os- osb osc osh osi osk oso osr oss rbb rbc rbh rbi rbk rbo rbr rbs rcb rcc rch rci rco rcr rcs rh- rhb rhc rhh rhi rho rhr rhs rib ric rih rii rik rio rir ris rkb rkc rkk rko rks rob roc roh roi rok roo ror ros rrb rrc rrh rri rrk rrr rrs rsb rsc rsh rsi rsk rso rsr rss sbb sbc sbh sbi sbk sbo sbr sbs scb scc sch sci sck sco scr scs sh- shb shc shh shi shk sho shr shs sib sic sih sii sik sio sir sis sk- skb skc skh ski skk sko skr sks sob soc soh soi sok soo sor sos sr- srb src srh sri srk sro srr srs ss- ssb ssc ssh ssi ssk sso ssr sss