-er a-a a-c aaa aac aad aae aag aak aap aar ac- aca acc acd ace acg ack acp acr ad- ada adc add ade adg adk adp adr aea aec aed aee aeg aek aep aer ag- aga agc agd age agg agk agp agr aka akc akd ake akg akk akp akr ap- apa apc apd ape apg apk app apr ar- ara arc ard are arg ark arp arr c-- caa cac cad cae cag cak cap car cca ccc ccd cce ccg cck ccp ccr cda cdc cdd cde cdg cdk cdp cdr ce- cea cec ced cee ceg cek cep cer cga cgc cgd cge cgg cgp cgr cka ckc ckd cpa cpc cpd cpe cpg cpk cpp cpr cra crc crd cre crg crk crp crr daa dac dad dae dag dak dap dar dca dcc dcd dce dcg dck dcp dcr dda ddc ddd dde ddg ddk ddp ddr de- dea dec ded dee deg dek dep der dga dgc dgd dge dgg dgk dgp dgr dka dkc dke dkg dkk dkp dkr dpa dpc dpd dpe dpg dpk dpp dpr dra drc drd dre drg drk drp drr eaa eac ead eae eag eak eap ear ec- eca ecc ecd ece ecg eck ecr ed- eda edc edd ede edg edk edp edr eea eec eed eee eeg eek eep eer ega egc egd ege egg egp egr eka ekc ekd eke ekg ekp ekr ep- epa epc epd epe epg epp epr era erc erd ere erg erk erp err g-d g-p gaa gac gad gae gag gak gap gar gca gcc gcd gce gcg gck gcp gcr gda gdc gdd gde gdk gdp gdr ge- gea gec ged gee geg gek gep ger gga ggc ggd ggg ggp ggr gka gkd gkp gpa gpc gpd gpe gpg gpk gpp gpr gra grc grd gre grg grk grp grr ka- kaa kac kad kae kag kak kap kar kca kcc kcd kce kcg kck kcp kcr kda kdc kde kdg kdk kdp kdr ke- kea kec ked kee keg kek kep ker kga kgc kgd kgp kkc kke kkk kkp kkr kpa kpc kpd kpe kpk kpp kpr kra krc krd krg krk krp krr p-p paa pac pad pae pag pak pap par pca pcc pcd pce pcg pck pcp pcr pda pdc pdd pde pdg pdk pdp pdr pea pec ped pee peg pek pep per pga pgc pgd pge pgg pgk pgp pgr pka pkc pkd pke pkg pkp pkr ppa ppc ppd ppe ppg ppk ppp ppr pra prc prd pre prg prk prp prr ra- raa rac rad rae rag rak rap rar rca rcc rcd rce rcg rcp rcr rda rdc rdd rde rdg rdp rdr re- rea rec red ree reg rek rep rer rga rgc rgd rge rgg rgk rgp rgr rkc rke rkg rkk rkp rpa rpc rpd rpe rpg rpk rpp rpr rra rrc rrd rrg rrk rrp rrr