-er a-a a-c aaa aac aad aae aaf aak aao aap aar ac- aca acc acd ace acf ack aco acp acr ad- ada adc add ade adf adk ado adp adr aea aec aed aee aef aek aeo aep aer af- afa afc afd afe aff afk afo afp afr aka akc akd ake akk ako akp akr aoa aoc aod aoe aof aok aoo aop aor ap- apa apc apd ape apf apk apo app apr ar- ara arc ard are arf ark aro arp arr c-- caa cac cad cae caf cak cao cap car cca ccc ccd cce ccf cck cco ccp ccr cda cdc cdd cde cdf cdk cdo cdp cdr ce- cea cec ced cee cef cek ceo cep cer cfa cfc cfd cfe cff cfk cfo cfp cfr cka ckc ckd cko co- coa coc cod coe cof cok coo cop cor cpa cpc cpd cpe cpf cpk cpo cpp cpr cra crc crd cre crf crk cro crp crr daa dac dad dae daf dak dao dap dar dca dcc dcd dce dcf dck dco dcp dcr dda ddc ddd dde ddf ddk ddo ddp ddr de- dea dec ded dee def dek deo dep der dfa dfc dfd dfe dff dfk dfo dfp dfr dka dkc dke dkk dko dkp dkr doa doc dod doe dof dok doo dop dor dpa dpc dpd dpe dpf dpk dpo dpp dpr dra drc drd dre drk dro drp drr eaa eac ead eae eaf eak eao eap ear ec- eca ecc ecd ece ecf eck eco ecr ed- eda edc edd ede edf edk edo edp edr eea eec eed eee eef eek eeo eep eer ef- efa efc efd efe eff efo efp efr eka ekc ekd eke ekf eko ekp ekr eo- eoa eoc eod eoe eof eok eoo eop eor ep- epa epc epd epe epf epo epp epr era erc erd ere erf erk ero erp err faa fac fad fae faf fak fao fap far fca fcc fcd fce fcf fck fco fcp fcr fda fdc fdd fde fdf fdk fdo fdp fdr fea fec fed fee fef fek feo fep fer ffa ffc ffd ffe fff ffk ffo ffp ffr fka fkc fkf fkk fkp foa foc foe fof fok foo fop for fpa fpc fpd fpe fpk fpo fpp fpr fra frc frd fre frf frk fro frp frr ka- kaa kac kad kae kaf kak kao kap kar kca kcc kcd kce kck kcp kcr kda kdc kde kdf kdk kdo kdp kdr ke- kea kec ked kee kef kek keo kep ker kfa kfc kfd kff kfo kkc kke kkk kkp kkr koa koc kod koe kof kok koo kop kor kpa kpc kpd kpe kpf kpk kpo kpp kpr kra krc krd krf krk kro krp krr oaa oac oad oae oaf oak oao oap oar oc- oca occ ocd ocf ock 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 oka okc okd oke okk oko okp okr oo- ooa ooc ood oof ook ooo oop oor op- opa opc opd ope opf opk opo opp opr or- ora orc ord ore orf ork oro orp orr p-p paa pac pad pae paf pak pao pap par pca pcc pcd pce pcf pck pco pcp pcr pda pdc pdd pde pdf pdk pdo pdp pdr pea pec ped pee pef pek peo pep per pfa pfc pfd pfe pff pfk pfo pfp pfr pka pkc pkd pke pkf pko pkp pkr poa poc pod poe pof pok poo pop por ppa ppc ppd ppe ppf ppk ppo ppp ppr pra prc prd pre prf prk pro prp prr ra- raa rac rad rae raf rak 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 rek reo rep rer rfa rfc rfd rfe rff rfk rfo rfp rfr rkc rke rkf rkk rko rkp roa roc rod roe rof rok roo rop ror rpa rpc rpd rpe rpf rpk rpo rpp rpr rra rrc rrd rrf rrk rrp rrr