-er a-a a-c aaa aac aae aak aam aao aap aar aas ac- aca acc ace ack acm aco acp acr acs aea aec aee aek aem aeo aep aer aes aka akc ake akk akm ako akp akr aks ama amc ame amk amm amo amp amr ams aoa aoc aoe aok aom aoo aop aor aos ap- apa apc ape apk apm apo app apr aps ar- ara arc are ark arm aro arp arr ars as- asa asc ase ask asm aso asp asr ass c-- caa cac cae cak cam cao cap car cas cca ccc cce cck ccm cco ccp ccr ccs ce- cea cec cee cek cem ceo cep cer ces cka ckc ckm cko cks cma cmc cme cmk cmm cmo cmp cmr cms co- coa coc coe cok com coo cop cor cos cpa cpc cpe cpk cpm cpo cpp cpr cps cra crc cre crk crm cro crp crr crs csa csc cse csk csm cso csp csr css eaa eac eae eak eam eao eap ear eas ec- eca ecc ece eck ecm eco ecr ecs eea eec eee eek eem eeo eep eer ees eka ekc eke eko ekp ekr eks em- ema emc eme emk emm emo emp emr ems eo- eoa eoc eoe eok eom eoo eop eor eos ep- epa epc epe epm epo epp epr eps era erc ere erk erm ero erp err ers es- esa esc ese esk esm eso esp esr ess ka- kaa kac kae kak kam kao kap kar kas kca kcc kce kck kcm kcp kcr kcs ke- kea kec kee kek kem keo kep ker kes kkc kke kkk kkm kkp kkr kks kma kmc kme kmk kmm kmo kmp kms koa koc koe kok kom koo kop kor kos kpa kpc kpe kpk kpm kpo kpp kpr kps kra krc krk kro krp krr krs ksa ksc kse ksk ksm kso ksp ksr kss m-o m-r maa mac mae mak mam mao map mar mas mc- mca mcc mce mck mcm mco mcp mcr mcs mea mec mee mek mem meo mep mer mes mka mkc mke mkk mkm mko mkp mkr mks mma mmc mme mmk mmm mmo mmp mmr mms moa moc moe mok mom moo mop mor mos mpa mpc mpe mpk mpm mpo mpp mpr mps mra mrc mre mrk mrm mro mrp mrr mrs msa msc mse msk msm mso msp msr mss oaa oac oae oak oam oao oap oar oas oc- oca occ ock ocm oco ocp ocr ocs oea oec oee oem oeo oep oer oes oka okc oke okk oko okp okr oks om- oma omc ome omm omo omp omr oms oo- ooa ooc ook oom ooo oop oor oos op- opa opc ope opk opm opo opp opr ops or- ora orc ore ork orm oro orp orr ors os- osa osc ose osk osm oso osp osr oss p-p paa pac pae pak pam pao pap par pas pca pcc pce pck pcm pco pcp pcr pcs pea pec pee pek pem peo pep per pes pka pkc pke pkm pko pkp pkr pks pma pmc pme pmk pmm pmo pmp pmr pms poa poc poe pok pom poo pop por pos ppa ppc ppe ppk ppm ppo ppp ppr pps pra prc pre prk prm pro prp prr prs ps- psa psc pse psk psm pso psp psr pss ra- raa rac rae rak ram rao rap rar ras rca rcc rce rcm rco rcp rcr rcs re- rea rec ree rek rem reo rep rer res rkc rke rkk rkm rko rkp rks rma rmc rme rmm rmo rmp rmr rms roa roc roe rok rom roo rop ror ros rpa rpc rpe rpk rpm rpo rpp rpr rps rra rrc rrk rrm rrp rrr rrs rsa rsc rse rsk rsm rso rsp rsr rss saa sac sae sak sam sao sap sar sas sca scc sce sck scm sco scp scr scs se- sea sec see sek sem seo sep ser ses sk- ska skc ske skk skm sko skp skr sks sma smc sme smk smm smo smp smr sms soa soc soe sok som soo sop sor sos spa spc spe spk spm spo spp spr sps sr- sra src sre srk srm sro srp srr srs ss- ssa ssc sse ssk ssm sso ssp ssr sss