-er a-a a-b a-i aaa aab aae aai aak aam aao aap aar aas ab- aba abb abe abi abk abm abo abp abr abs aea aeb aee aei aek aem aeo aep aer aes ai- aia aib aie aii aik aim aio aip air ais aka akb ake aki akk akm ako akp akr aks ama amb ame ami amk amm amo amp amr ams aoa aob aoe aoi aok aom aoo aop aor aos ap- apa apb ape api apk apm apo app apr aps ar- ara arb are ari ark arm aro arp arr ars as- asa asb ase asi ask asm aso asp asr ass b-p baa bab bae bai bak bam bao bap bar bas bba bbb bbe bbi bbk bbm bbo bbp bbr bbs be- bea beb bee bei bek bem beo bep ber bes bi- bia bib bie bii bik bim bio bip bir bis bka bkb bke bkk bkm bko bkp bkr bks bma bmb bme bmi bmk bmm bmo bmp bmr bms boa bob boe boi bok bom boo bop bor bos bpa bpb bpe bpi bpm bpo bpp bpr bps bra brb bre bri brk brm bro brp brr brs bsa bsb bse bsi bsk bsm bso bsp bsr bss eaa eab eae eai eak eam eao eap ear eas eba ebb ebe ebi ebk ebm ebo ebp ebr ebs eea eeb eee eek eem eeo eep eer ees eia eib eie eii eik eim eio eip eir eis eka ekb eke eki eko ekp ekr eks em- ema emb eme emi emk emm emo emp emr ems eo- eoa eob eoe eoi eok eom eoo eop eor eos ep- epa epb epe epi epm epo epp epr eps era erb ere eri erk erm ero erp err ers es- esa esb ese esi esk esm eso esp esr ess ia- iaa iab iae iai iam iao iap iar ias iba ibb ibe ibi ibk ibm ibo ibp ibr ibs ie- iea iee iei iek iem iep ier ies iia iib iie iii iim iio iip iir iis ika ikb ike iki ikk iko ikr iks im- ima imb ime imi imm imo imp ims io- ioa iob ioe ioi iom ioo iop ior ios ipa ipb ipe ipi ipm ipo ipp ipr ips ir- ira irb ire iri irk irm iro irp irr irs is- isa isb ise isi isk ism iso isp isr iss ka- kaa kab kae kai kak kam kao kap kar kas kba kbb kbe kbi kbk kbm kbo kbp kbr kbs ke- kea keb kee kei kek kem keo kep ker kes kia kib kie kii kik kim kio kip kir kis kkb kke kki kkk kkm kkp kkr kks kma kmb kme kmi kmk kmm kmo kmp kms koa kob koe koi kok kom koo kop kor kos kpa kpe kpi kpk kpm kpo kpp kpr kps kra kri krk kro krp krr krs ksa ksb kse ksi ksk ksm kso ksp ksr kss m-o m-r maa mab mae mai mak mam mao map mar mas mba mbb mbe mbi mbk mbm mbo mbp mbr mbs mea meb mee mei mek mem meo mep mer mes mi- mia mib mie mii mik mim mio mip mir mis mka mkb mke mkk mkm mko mkp mkr mks mma mmb mme mmi mmk mmm mmo mmp mmr mms moa mob moe moi mok mom moo mop mor mos mpa mpb mpe mpi mpk mpm mpo mpp mpr mps mra mrb mre mri mrk mrm mro mrp mrr mrs msa msb mse msi msk msm mso msp msr mss o-i oaa oab oae oai oak oam oao oap oar oas ob- oba obb obe obi obk obm obo obp obr obs oea oeb oee oei oem oeo oep oer oes oia oib oie oii oik oim oio oip oir ois oka okb oke oki okk oko okp okr oks om- oma omb ome omi omm omo omp omr oms oo- ooa oob ooi ook oom ooo oop oor oos op- opa opb ope opi opk opm opo opp opr ops or- ora orb ore ori ork orm oro orp orr ors os- osa osb ose osi osk osm oso osp osr oss p-p paa pab pae pai pak pam pao pap par pas pba pbb pbe pbi pbk pbm pbo pbp pbr pbs pea peb pee pei pek pem peo pep per pes pia pib pie pii pik pim pio pip pir pis pka pkb pke pki pkm pko pkp pkr pks pma pmb pme pmi pmk pmm pmo pmp pmr pms poa pob poe poi pok pom poo pop por pos ppa ppb ppe ppi ppk ppm ppo ppp ppr pps pra prb pre pri prk prm pro prp prr prs ps- psa psb pse psi psk psm pso psp psr pss ra- raa rab rae rai rak ram rao rap rar ras rba rbb rbe rbi rbk rbm rbo rbp rbr rbs re- rea reb ree rei rek rem reo rep rer res ria rib rie rii rik rim rio rip rir ris rkb rke rkk rkm rko rkp rks rma rmb rme rmi rmm rmo rmp rmr rms roa rob roe roi rok rom roo rop ror ros rpa rpb rpe rpi rpk rpm rpo rpp rpr rps rra rrb rri rrk rrm rrp rrr rrs rsa rsb rse rsi rsk rsm rso rsp rsr rss saa sab sae sai sak sam sao sap sar sas sba sbb sbe sbi sbk sbm sbo sbp sbr sbs se- sea seb see sei sek sem seo sep ser ses sia sib sie sii sik sim sio sip sir sis sk- ska skb ske ski skk skm sko skp skr sks sma smb sme smi smk smm smo smp smr sms soa sob soe soi sok som soo sop sor sos spa spb spe spi spk spm spo spp spr sps sr- sra srb sre sri srk srm sro srp srr srs ss- ssa ssb sse