-er b-p bbb bbe bbh bbi bbk bbo bbp bbr bbs be- beb bee beh bei bek beo bep ber bes bhb bhe bhh bhi bhk bho bhp bhr bhs bi- bib bie bih bii bik bio bip bir bis bkb bke bkk bko bkp bkr bks bob boe boh boi bok boo bop bor bos bpb bpe bph bpi bpo bpp bpr bps brb bre brh bri brk bro brp brr brs bsb bse bsh bsi bsk bso bsp bsr bss ebb ebe ebh ebi ebk ebo ebp ebr ebs eeb eee eek eeo eep eer ees ehb ehe ehh ehi eho ehp ehr ehs eib eie eii eik eio eip eir eis ekb eke ekh eki eko ekp ekr eks eo- eob eoe eoh eoi eok eoo eop eor eos ep- epb epe eph epi epo epp epr eps erb ere erh eri erk ero erp err ers es- esb ese esh esi esk eso esp esr ess h-i hbb hbe hbh hbi hbk hbo hbp hbr hbs he- heb hee heh hei hek heo hep her hes hhb hhe hhh hhi hhk hho hhp hhr hhs hib hie hih hii hik hio hip hir his hkb hkh hki hkk hko hkp hkr hks hob hoe hoh hoi hok hoo hop hor hos hpb hpe hph hpi hpk hpo hpp hpr hps hr- hrb hre hrh hri hrk hro hrp hrr hrs hsb hse hsh hsi hsk hsp hsr hss ibb ibe ibh ibi ibk ibo ibp ibr ibs ie- iee iei iek iep ier ies ihb ihe ihh ihi ihk iho ihp ihr ihs iib iie iih iii iio iip iir iis ikb ike iki ikk iko ikr iks io- iob ioe ioh ioi ioo iop ior ios ipb ipe ipi ipo ipp ipr ips ir- irb ire iri irk iro irp irr irs is- isb ise ish isi isk iso isp isr iss kbb kbe kbh kbi kbk kbo kbp kbr kbs ke- keb kee keh kei kek keo kep ker kes khe khh khi khk kho khr khs kib kie kih kii kik kio kip kir kis kkb kke kkh kki kkk kkp kkr kks kob koe koh koi kok koo kop kor kos kpe kph kpi kpk kpo kpp kpr kps kri krk kro krp krr krs ksb kse ksh ksi ksk kso ksp ksr kss o-i ob- obb obe obh obi obk obo obp obr obs oeb oee oeh oei oeo oep oer oes ohe ohh ohi oho ohp ohr ohs oib oie oii oik oio oip oir ois okb oke oki okk oko okp okr oks oo- oob ooh ooi ook ooo oop oor oos op- opb ope oph opi opk opo opp opr ops or- orb ore orh ori ork oro orp orr ors os- osb ose osh osi osk oso osp osr oss p-p pbb pbe pbi pbk pbo pbp pbr pbs peb pee peh pei pek peo pep per pes phb phe phi phk pho php phr phs pib pie pih pii pik pio pip pir pis pkb pke pki pko pkp pkr pks pob poe poh poi pok poo pop por pos ppb ppe pph ppi ppk ppo ppp ppr pps prb pre prh pri prk pro prp prr prs ps- psb pse psh psi psk pso psp psr pss rbb rbe rbh rbi rbk rbo rbp rbr rbs re- reb ree reh rei rek reo rep rer res rh- rhb rhe rhh rhi rho rhp rhr rhs rib rie rih rii rik rio rip rir ris rkb rke rkk rko rkp rks rob roe roh roi rok roo rop ror ros rpb rpe rph rpi rpk rpo rpp rpr rps rrb rrh rri rrk rrp rrr rrs rsb rse rsh rsi rsk rso rsp rsr rss sbb sbe sbh sbi sbk sbo sbp sbr sbs se- seb see seh sei sek seo sep ser ses sh- shb she shh shi shk sho shp shr shs sib sie sih sii sik sio sip sir sis sk- skb ske skh ski skk sko skp skr sks sob soe soh soi sok soo sop sor sos spb spe sph spi spk spo spp spr sps sr- srb sre srh sri srk sro srp srr srs ss- ssb sse ssh ssi ssk sso ssp ssr sss