-er a-a a-c a-t aaa aac aae aam aao aap aar aas aat ac- aca acc ace acm aco acp acr acs act aea aec aee aem aeo aep aer aes aet ama amc ame amm amo amp amr ams amt aoa aoc aoe aom aoo aop aor aos aot ap- apa apc ape apm apo app apr aps apt ar- ara arc are arm aro arp arr ars art as- asa asc ase asm aso asp asr ass ast at- ata atc ate atm ato atp atr ats att c-- caa cac cae cam cao cap car cas cat cca ccc cce ccm cco ccp ccr ccs cct ce- cea cec cee cem ceo cep cer ces cet cma cmc cme cmm cmo cmp cmr cms cmt co- coa coc coe com coo cop cor cos cot cpa cpc cpe cpm cpo cpp cpr cps cpt cra crc cre crm cro crp crr crs crt csa csc cse csm cso csp csr css cst cta ctc cte ctm cto ctp ctr cts ctt eaa eac eae eam eao eap ear eas eat ec- eca ecc ece ecm eco ecr ecs ect eea eec eee eem eeo eep eer ees eet em- ema emc eme emm emo emp emr ems emt eo- eoa eoc eoe eom eoo eop eor eos eot ep- epa epc epe epm epo epp epr eps ept era erc ere erm ero erp err ers ert es- esa esc ese esm eso esp esr ess est eta etc ete etm eto etp etr ets ett m-o m-r maa mac mae mam mao map mar mas mat mc- mca mcc mce mcm mco mcp mcr mcs mct mea mec mee mem meo mep mer mes met mma mmc mme mmm mmo mmp mmr mms mmt moa moc moe mom moo mop mor mos mot mpa mpc mpe mpm mpo mpp mpr mps mpt mra mrc mre mrm mro mrp mrr mrs mrt msa msc mse msm mso msp msr mss mst mta mtc mte mtm mto mtp mtr mts mtt oaa oac oae oam oao oap oar oas oat oc- oca occ ocm oco ocp ocr ocs oct oea oec oee oem oeo oep oer oes oet om- oma omc ome omm omo omp omr oms omt oo- ooa ooc oom ooo oop oor oos oot op- opa opc ope opm opo opp opr ops opt or- ora orc ore orm oro orp orr ors ort os- osa osc ose osm oso osp osr oss ost ot- ota otc ote otm oto otp otr ots ott p-p paa pac pae pam pao pap par pas pat pca pcc pce pcm pco pcp pcr pcs pct pea pec pee pem peo pep per pes pet pma pmc pme pmm pmo pmp pmr pms pmt poa poc poe pom poo pop por pos pot ppa ppc ppe ppm ppo ppp ppr pps ppt pra prc pre prm pro prp prr prs prt ps- psa psc pse psm pso psp psr pss pst pt- pta ptc pte ptm pto ptp ptr pts ptt ra- raa rac rae ram rao rap rar ras rat rca rcc rce rcm rco rcp rcr rcs rct re- rea rec ree rem reo rep rer res ret rma rmc rme rmm rmo rmp rmr rms rmt roa roc roe rom roo rop ror ros rot rpa rpc rpe rpm rpo rpp rpr rps rpt rra rrc rrm rrp rrr rrs rrt rsa rsc rse rsm rso rsp rsr rss rst rta rtc rte rtm rto rtp rtr rts rtt saa sac sae sam sao sap sar sas sat sca scc sce scm sco scp scr scs sct se- sea sec see sem seo sep ser ses set sma smc sme smm smo smp smr sms smt soa soc soe som soo sop sor sos sot spa spc spe spm spo spp spr sps spt sr- sra src sre srm sro srp srr srs srt ss- ssa ssc sse ssm sso ssp ssr sss sst sta stc ste stm sto stp str sts stt taa tac tae tam tao tap tar tas tat tca tcc tce tcm tco tcp tcr tcs tct te- tea tec tee tem teo tep ter tes tet tma tmc tme tmm tmo tmp tmr tms tmt to- toa toc toe tom too top tor tos tot tpa tpc tpe tpm tpo tpp tpr tps tpt tra trc tre trm tro trp trr trs trt tsa tsc tse tsm tso tsp tsr tss tst tta ttc tte ttm tto ttp ttr tts ttt