-er a-a a-c aaa aac aad aae aaf aao aap aar aas ac- aca acc acd ace acf aco acp acr acs ad- ada adc add ade adf ado adp adr ads aea aec aed aee aef aeo aep aer aes af- afa afc afd afe aff afo afp afr afs aoa aoc aod aoe aof aoo aop aor aos ap- apa apc apd ape apf apo app apr aps ar- ara arc ard are arf aro arp arr ars as- asa asc asd ase asf aso asp asr ass c-- caa cac cad cae caf cao cap car cas cca ccc ccd cce ccf cco ccp ccr ccs cda cdc cdd cde cdf cdo cdp cdr cds ce- cea cec ced cee cef ceo cep cer ces cfa cfc cfd cfe cff cfo cfp cfr cfs co- coa coc cod coe cof coo cop cor cos cpa cpc cpd cpe cpf cpo cpp cpr cps cra crc crd cre crf cro crp crr crs csa csc csd cse csf cso csp csr css daa dac dad dae daf dao dap dar das dca dcc dcd dce dcf dco dcp dcr dcs dda ddc ddd dde ddf ddo ddp ddr dds de- dea dec ded dee def deo dep der des dfa dfc dfd dfe dff dfo dfp dfr dfs doa doc dod doe dof doo dop dor dos dpa dpc dpd dpe dpf dpo dpp dpr dps dra drc drd dre dro drp drr drs dsa dsc dsd dse dsf dso dsp dsr dss eaa eac ead eae eaf eao eap ear eas ec- eca ecc ecd ece ecf eco ecr ecs ed- eda edc edd ede edf edo edp edr eds eea eec eed eee eef eeo eep eer ees ef- efa efc efd efe eff efo efp efr efs eo- eoa eoc eod eoe eof eoo eop eor eos ep- epa epc epd epe epf epo epp epr eps era erc erd ere erf ero erp err ers es- esa esc esd ese esf eso esp esr ess faa fac fad fae faf fao fap far fas fca fcc fcd fce fcf fco fcp fcr fcs fda fdc fdd fde fdf fdo fdp fdr fds fea fec fed fee fef feo fep fer fes ffa ffc ffd ffe fff ffo ffp ffr ffs foa foc foe fof foo fop for fos fpa fpc fpd fpe fpo fpp fpr fps fra frc frd fre frf fro frp frr frs fsa fsc fsd fse fsf fso fsp fsr fss oaa oac oad oae oaf oao oap oar oas oc- oca occ ocd ocf oco ocp ocr ocs oda odc odd ode odf odo odp odr ods oea oec oed oee oef oeo oep oer oes of- ofa ofc ofd ofe off ofo ofp ofr ofs oo- ooa ooc ood oof ooo oop oor oos op- opa opc opd ope opf opo opp opr ops or- ora orc ord ore orf oro orp orr ors os- osa osc osd ose osf oso osp osr oss p-p paa pac pad pae paf pao pap par pas pca pcc pcd pce pcf pco pcp pcr pcs pda pdc pdd pde pdf pdo pdp pdr pds pea pec ped pee pef peo pep per pes pfa pfc pfd pfe pff pfo pfp pfr pfs poa poc pod poe pof poo pop por pos ppa ppc ppd ppe ppf ppo ppp ppr pps pra prc prd pre prf pro prp prr prs ps- psa psc psd pse psf pso psp psr pss ra- raa rac rad rae raf rao rap rar ras rca rcc rcd rce rcf rco rcp rcr rcs rda rdc rdd rde rdf rdo rdp rdr rds re- rea rec red ree ref reo rep rer res rfa rfc rfd rfe rff rfo rfp rfr rfs roa roc rod roe rof roo rop ror ros rpa rpc rpd rpe rpf rpo rpp rpr rps rra rrc rrd rrf rrp rrr rrs rsa rsc rsd rse rsf rso rsp rsr rss saa sac sad sae saf sao sap sar sas sca scc scd sce scf sco scp scr scs sda sdc sdd sde sdf sdo sdp sdr sds se- sea sec sed see sef seo sep ser ses sfa sfc sfd sfe sff sfo sfp sfr sfs soa soc sod soe sof soo sop sor sos spa spc spd spe spf spo spp spr sps sr- sra src srd sre srf sro srp srr srs ss- ssa ssc ssd sse ssf sso ssp ssr sss