-er -ic bbb bbc bbe bbh bbi bbk bbo bbr bbs bcb bcc bce bch bci bck bco bcr bcs be- beb bec bee beh bei bek beo ber bes bhb bhc bhe bhh bhi bhk bho bhr bhs bi- bib bic bie bih bii bik bio bir bis bkb bkc bke bkk bko bkr bks bob boc boe boh boi bok boo bor bos brb bre brh bri brk bro brr brs bsb bsc bse bsh bsi bsk bso bsr bss c-- cbb cbc cbe cbh cbi cbk cbo cbr cbs ccb ccc cce cch cci cck cco ccr ccs ce- ceb cec cee ceh cei cek ceo cer ces ch- chb chc che chh chi chk cho chr chs ci- cib cic cie cih cii cik cio cir cis ckb ckc ckh cki cko cks co- cob coc coe coh coi cok coo cor cos crb crc cre crh cri crk cro crr crs csb csc cse csh csi csk cso csr css ebb ebc ebe ebh ebi ebk ebo ebr ebs ec- ecb ecc ece ech eci eck eco ecr ecs eeb eec eee eek eeo eer ees ehb ehc ehe ehh ehi eho ehr ehs eib eic eie eii eik eio eir eis ekb ekc eke ekh eki eko ekr eks eo- eob eoc eoe eoh eoi eok eoo eor eos erb erc ere erh eri erk ero err ers es- esb esc ese esh esi esk eso esr ess h-i hbb hbc hbe hbh hbi hbk hbo hbr hbs hcb hcc hce hch hci hck hco hcr hcs he- heb hec hee heh hei hek heo her hes hhb hhc hhe hhh hhi hhk hho hhr hhs hib hic hie hih hii hik hio hir his hkb hkh hki hkk hko hkr hks hob hoc hoe hoh hoi hok hoo hor hos hr- hrb hrc hre hrh hri hrk hro hrr hrs hsb hsc hse hsh hsi hsk hsr hss ibb ibc ibe ibh ibi ibk ibo ibr ibs icb icc ice ich ici ick ico icr ics ie- iec iee iei iek ier ies ihb ihc ihe ihh ihi ihk iho ihr ihs iib iic iie iih iii iio iir iis ikb ikc ike iki ikk iko ikr iks io- iob ioc ioe ioh ioi ioo ior ios ir- irb irc ire iri irk iro irr irs is- isb isc ise ish isi isk iso isr iss kbb kbc kbe kbh kbi kbk kbo kbr kbs kcb kcc kce kch kci kck kcr kcs ke- keb kec kee keh kei kek keo ker kes khe khh khi khk kho khr khs kib kic kie kih kii kik kio kir kis kkb kkc kke kkh kki kkk kkr kks kob koc koe koh koi kok koo kor kos krc kri krk kro krr krs ksb ksc kse ksh ksi ksk kso ksr kss o-i ob- obb obc obe obh obi obk obo obr obs oc- ocb occ och oci ock oco ocr ocs oeb oec oee oeh oei oeo oer oes ohc ohe ohh ohi oho ohr ohs oib oic oie oii oik oio oir ois okb okc oke oki okk oko okr oks oo- oob ooc ooh ooi ook ooo oor oos or- orb orc ore orh ori ork oro orr ors os- osb osc ose osh osi osk oso osr oss rbb rbc rbe rbh rbi rbk rbo rbr rbs rcb rcc rce rch rci rco rcr rcs re- reb rec ree reh rei rek reo rer res rh- rhb rhc rhe rhh rhi rho rhr rhs rib ric rie rih rii rik rio rir ris rkb rkc rke rkk rko rks rob roc roe roh roi rok roo ror ros rrb rrc rrh rri rrk rrr rrs rsb rsc rse rsh rsi rsk rso rsr rss sbb sbc sbe sbh sbi sbk sbo sbr sbs scb scc sce sch sci sck sco scr scs se- seb sec see seh sei sek seo ser ses sh- shb shc she shh shi shk sho shr shs sib sic sie sih sii sik sio sir sis sk- skb skc ske skh ski skk sko skr sks sob soc soe soh soi sok soo sor sos sr- srb src sre srh sri srk sro srr srs ss- ssb ssc sse ssh ssi ssk sso ssr sss