-er a-a a-c aaa aac aad aae aag aao aap aar ac- aca acc acd ace acg aco acp acr ad- ada adc add ade adg ado adp adr aea aec aed aee aeg aeo aep aer ag- aga agc agd age agg ago agp agr aoa aoc aod aoe aog aoo aop aor ap- apa apc apd ape apg apo app apr ar- ara arc ard are arg aro arp arr c-- caa cac cad cae cag cao cap car cca ccc ccd cce ccg cco ccp ccr cda cdc cdd cde cdg cdo cdp cdr ce- cea cec ced cee ceg ceo cep cer cga cgc cgd cge cgg cgo cgp cgr co- coa coc cod coe cog coo cop cor cpa cpc cpd cpe cpg cpo cpp cpr cra crc crd cre crg cro crp crr daa dac dad dae dag dao dap dar dca dcc dcd dce dcg dco dcp dcr dda ddc ddd dde ddg ddo ddp ddr de- dea dec ded dee deg deo dep der dga dgc dgd dge dgg dgp dgr doa doc dod doe dog doo dop dor dpa dpc dpd dpe dpg dpo dpp dpr dra drc drd dre drg dro drp drr eaa eac ead eae eag eao eap ear ec- eca ecc ecd ece ecg eco ecr ed- eda edc edd ede edg edo edp edr eea eec eed eee eeg eeo eep eer ega egc egd ege egg ego egp egr eo- eoa eoc eod eoe eog eoo eop eor ep- epa epc epd epe epg epo epp epr era erc erd ere erg ero erp err g-d g-p gaa gac gad gae gag gao gap gar gca gcc gcd gce gcg gco gcp gcr gda gdc gdd gde gdo gdp gdr ge- gea gec ged gee geg geo gep ger gga ggc ggd ggg ggo ggp ggr goa goc god goe gog goo gop gor gpa gpc gpd gpe gpg gpo gpp gpr gra grc grd gre grg gro grp grr oaa oac oad oae oag oao oap oar oc- oca occ ocd ocg oco ocp ocr oda odc odd ode odg odo odp odr oea oec oed oee oeg oeo oep oer oga ogc ogd oge ogg ogo ogp oo- ooa ooc ood oog ooo oop oor op- opa opc opd ope opg opo opp opr or- ora orc ord ore org oro orp orr p-p paa pac pad pae pag pao pap par pca pcc pcd pce pcg pco pcp pcr pda pdc pdd pde pdg pdo pdp pdr pea pec ped pee peg peo pep per pga pgc pgd pge pgg pgo pgp pgr poa poc pod poe pog poo pop por ppa ppc ppd ppe ppg ppo ppp ppr pra prc prd pre prg pro prp prr ra- raa rac rad rae rag rao rap rar rca rcc rcd rce rcg rco rcp rcr rda rdc rdd rde rdg rdo rdp rdr re- rea rec red ree reg reo rep rer rga rgc rgd rge rgg rgo rgp rgr roa roc rod roe rog roo rop ror rpa rpc rpd rpe rpg rpo rpp rpr rra rrc rrd rrg rrp rrr