-er a-a a-b aaa aab aae aah aak aao aap aar aas ab- aba abb abe abh abk abo abp abr abs aea aeb aee aeh aek aeo aep aer aes aha ahb ahe ahh ahk aho ahp ahr ahs aka akb ake akh akk ako akp akr aks aoa aob aoe aoh aok aoo aop aor aos ap- apa apb ape aph apk apo app apr aps ar- ara arb are arh ark aro arp arr ars as- asa asb ase ash ask aso asp asr ass b-p baa bab bae bah bak bao bap bar bas bba bbb bbe bbh bbk bbo bbp bbr bbs be- bea beb bee beh bek beo bep ber bes bha bhb bhe bhh bhk bho bhp bhr bhs bka bkb bke bkk bko bkp bkr bks boa bob boe boh bok boo bop bor bos bpa bpb bpe bph bpo bpp bpr bps bra brb bre brh brk bro brp brr brs bsa bsb bse bsh bsk bso bsp bsr bss eaa eab eae eah eak eao eap ear eas eba ebb ebe ebh ebk ebo ebp ebr ebs eea eeb eee eek eeo eep eer ees eha ehb ehe ehh eho ehp ehr ehs eka ekb eke ekh eko ekp ekr eks eo- eoa eob eoe eoh eok eoo eop eor eos ep- epa epb epe eph epo epp epr eps era erb ere erh erk ero erp err ers es- esa esb ese esh esk eso esp esr ess haa hab hae hah hak hao hap har has hba hbb hbe hbh hbk hbo hbp hbr hbs he- hea heb hee heh hek heo hep her hes hha hhb hhe hhh hhk hho hhp hhr hhs hka hkb hkh hkk hko hkp hkr hks hoa hob hoe hoh hok hoo hop hor hos hpa hpb hpe hph hpk hpo hpp hpr hps hr- hra hrb hre hrh hrk hro hrp hrr hrs hsa hsb hse hsh hsk hsp hsr hss ka- kaa kab kae kah kak kao kap kar kas kba kbb kbe kbh kbk kbo kbp kbr kbs ke- kea keb kee keh kek keo kep ker kes kha khe khh khk kho khr khs kkb kke kkh kkk kkp kkr kks koa kob koe koh kok koo kop kor kos kpa kpe kph kpk kpo kpp kpr kps kra krk kro krp krr krs ksa ksb kse ksh ksk kso ksp ksr kss oaa oab oae oah oak oao oap oar oas ob- oba obb obe obh obk obo obp obr obs oea oeb oee oeh oeo oep oer oes oha ohe ohh oho ohp ohr ohs oka okb oke okk oko okp okr oks oo- ooa oob ooh ook ooo oop oor oos op- opa opb ope oph opk opo opp opr ops or- ora orb ore orh ork oro orp orr ors os- osa osb ose osh osk oso osp osr oss p-p paa pab pae pah pak pao pap par pas pba pbb pbe pbk pbo pbp pbr pbs pea peb pee peh pek peo pep per pes pha phb phe phk pho php phr phs pka pkb pke pko pkp pkr pks poa pob poe poh pok poo pop por pos ppa ppb ppe pph ppk ppo ppp ppr pps pra prb pre prh prk pro prp prr prs ps- psa psb pse psh psk pso psp psr pss ra- raa rab rae rah rak rao rap rar ras rba rbb rbe rbh rbk rbo rbp rbr rbs re- rea reb ree reh rek reo rep rer res rh- rha rhb rhe rhh rho rhp rhr rhs rkb rke rkk rko rkp rks roa rob roe roh rok roo rop ror ros rpa rpb rpe rph rpk rpo rpp rpr rps rra rrb rrh rrk rrp rrr rrs rsa rsb rse rsh rsk rso rsp rsr rss saa sab sae sah sak sao sap sar sas sba sbb sbe sbh sbk sbo sbp sbr sbs se- sea seb see seh sek seo sep ser ses sh- sha shb she shh shk sho shp shr shs sk- ska skb ske skh skk sko skp skr sks soa sob soe soh sok soo sop sor sos spa spb spe sph spk spo spp spr sps sr- sra srb sre srh srk sro srp srr srs ss- ssa ssb sse ssh ssk sso ssp ssr sss