-er a-a a-c aaa aac aad aae aag aan aao aap aar ac- aca acc acd ace acg acn aco acp acr ad- ada adc add ade adg adn ado adp adr aea aec aed aee aeg aen aeo aep aer ag- aga agc agd age agg agn ago agp agr an- ana anc and ane ang ann ano anp anr aoa aoc aod aoe aog aon aoo aop aor ap- apa apc apd ape apg apn apo app apr ar- ara arc ard are arg arn aro arp arr c-- caa cac cad cae cag can cao cap car cca ccc ccd cce ccg ccn cco ccp ccr cda cdc cdd cde cdg cdn cdo cdp cdr ce- cea cec ced cee ceg cen ceo cep cer cga cgc cgd cge cgg cgn cgo cgp cgr cn- cna cnc cnd cne cng cnn cno cnp cnr co- coa coc cod coe cog con coo cop cor cpa cpc cpd cpe cpg cpn cpo cpp cpr cra crc crd cre crg crn cro crp crr daa dac dad dae dag dan dao dap dar dca dcc dcd dce dcg dcn dco dcp dcr dda ddc ddd dde ddg ddn ddo ddp ddr de- dea dec ded dee deg den deo dep der dga dgc dgd dge dgg dgn dgp dgr dna dnc dnd dne dng dnn dno dnp dnr doa doc dod doe dog don doo dop dor dpa dpc dpd dpe dpg dpn dpo dpp dpr dra drc drd dre drg drn dro drp drr eaa eac ead eae eag ean eao eap ear ec- eca ecc ecd ece ecg ecn eco ecr ed- eda edc edd ede edg edn edo edp edr eea eec eed eee eeg een eeo eep eer ega egc egd ege egg egn ego egp egr en- ena enc end ene eng enn eno enp enr eo- eoa eoc eod eoe eog eon eoo eop eor ep- epa epc epd epe epg epn epo epp epr era erc erd ere erg ern ero erp err g-d g-p gaa gac gad gae gag gan gao gap gar gca gcc gcd gce gcg gcn gco gcp gcr gda gdc gdd gde gdn gdo gdp gdr ge- gea gec ged gee geg gen geo gep ger gga ggc ggd ggg ggn ggo ggp ggr gna gnc gnd gne gnn gno gnp gnr goa goc god goe gog gon goo gop gor gpa gpc gpd gpe gpg gpn gpo gpp gpr gra grc grd gre grg grn gro grp grr naa nac nad nae nag nan nao nap nar nca ncc ncd nce ncg ncn nco ncp ncr nda ndc ndd nde ndg ndn ndo ndp ndr ne- nea nec ned nee neg nen neo nep ner nga ngc ngd nge ngg ngn ngo ngp nna nnc nne nng nnn nno nnp no- noa noc nod noe nog non noo nop nor npa npc npd npe npg npn npo npp npr nra nrc nrd nre nrg nrn nro nrp nrr oaa oac oad oae oag oan oao oap oar oc- oca occ ocd ocg ocn oco ocp ocr oda odc odd ode odg odn odo odp odr oea oec oed oee oeg oen oeo oep oer oga ogc ogd oge ogg ogn ogo ogp on- ona onc ond one ong onn ono onp onr oo- ooa ooc ood oog oon ooo oop oor op- opa opc opd ope opg opn opo opp opr or- ora orc ord ore org orn oro orp orr p-p paa pac pad pae pag pan pao pap par pca pcc pcd pce pcg pcn pco pcp pcr pda pdc pdd pde pdg pdn pdo pdp pdr pea pec ped pee peg pen peo pep per pga pgc pgd pge pgg pgn pgo pgp pgr pn- pna pnc pnd pne png pnn pno pnp pnr poa poc pod poe pog pon poo pop por ppa ppc ppd ppe ppg ppn ppo ppp ppr pra prc prd pre prg prn pro prp prr ra- raa rac rad rae rag ran rao rap rar rca rcc rcd rce rcg rcn rco rcp rcr rda rdc rdd rde rdg rdn rdo rdp rdr re- rea rec red ree reg ren reo rep rer rga rgc rgd rge rgg rgn rgo rgp rgr rna rnc rnd rng rnn rno rnp rnr roa roc rod roe rog ron roo rop ror rpa rpc rpd rpe rpg rpn rpo rpp rpr rra rrc rrd rrg rrn rrp rrr