-er a-a a-c aaa aac aad aae aaf aao aap aar ac- aca acc acd ace acf aco acp acr ad- ada adc add ade adf ado adp adr aea aec aed aee aef aeo aep aer af- afa afc afd afe aff afo afp afr aoa aoc aod aoe aof aoo aop aor ap- apa apc apd ape apf apo app apr ar- ara arc ard are arf aro arp arr c-- caa cac cad cae caf cao cap car cca ccc ccd cce ccf cco ccp ccr cda cdc cdd cde cdf cdo cdp cdr ce- cea cec ced cee cef ceo cep cer cfa cfc cfd cfe cff cfo cfp cfr co- coa coc cod coe cof coo cop cor cpa cpc cpd cpe cpf cpo cpp cpr cra crc crd cre crf cro crp crr daa dac dad dae daf dao dap dar dca dcc dcd dce dcf dco dcp dcr dda ddc ddd dde ddf ddo ddp ddr de- dea dec ded dee def deo dep der dfa dfc dfd dfe dff dfo dfp dfr doa doc dod doe dof doo dop dor dpa dpc dpd dpe dpf dpo dpp dpr dra drc drd dre dro drp drr eaa eac ead eae eaf eao eap ear ec- eca ecc ecd ece ecf eco ecr ed- eda edc edd ede edf edo edp edr eea eec eed eee eef eeo eep eer ef- efa efc efd efe eff efo efp efr eo- eoa eoc eod eoe eof eoo eop eor ep- epa epc epd epe epf epo epp epr era erc erd ere erf ero erp err faa fac fad fae faf fao fap far fca fcc fcd fce fcf fco fcp fcr fda fdc fdd fde fdf fdo fdp fdr fea fec fed fee fef feo fep fer ffa ffc ffd ffe fff ffo ffp ffr foa foc foe fof foo fop for fpa fpc fpd fpe fpo fpp fpr fra frc frd fre frf fro frp frr oaa oac oad oae oaf oao oap oar oc- oca occ ocd ocf oco ocp ocr oda odc odd ode odf odo odp odr oea oec oed oee oef oeo oep oer of- ofa ofc ofd ofe off ofo ofp ofr oo- ooa ooc ood oof ooo oop oor op- opa opc opd ope opf opo opp opr or- ora orc ord ore orf oro orp orr p-p paa pac pad pae paf pao pap par pca pcc pcd pce pcf pco pcp pcr pda pdc pdd pde pdf pdo pdp pdr pea pec ped pee pef peo pep per pfa pfc pfd pfe pff pfo pfp pfr poa poc pod poe pof poo pop por ppa ppc ppd ppe ppf ppo ppp ppr pra prc prd pre prf pro prp prr ra- raa rac rad rae raf rao rap rar rca rcc rcd rce rcf rco rcp rcr rda rdc rdd rde rdf rdo rdp rdr re- rea rec red ree ref reo rep rer rfa rfc rfd rfe rff rfo rfp rfr roa roc rod roe rof roo rop ror rpa rpc rpd rpe rpf rpo rpp rpr rra rrc rrd rrf rrp rrr