-er a-a a-c aaa aac aae aag aam aao aap aar ac- aca acc ace acg acm aco acp acr aea aec aee aeg aem aeo aep aer ag- aga agc age agg agm ago agp agr ama amc ame amg amm amo amp amr aoa aoc aoe aog aom aoo aop aor ap- apa apc ape apg apm apo app apr ar- ara arc are arg arm aro arp arr c-- caa cac cae cag cam cao cap car cca ccc cce ccg ccm cco ccp ccr ce- cea cec cee ceg cem ceo cep cer cga cgc cge cgg cgm cgo cgp cgr cma cmc cme cmg cmm cmo cmp cmr co- coa coc coe cog com coo cop cor cpa cpc cpe cpg cpm cpo cpp cpr cra crc cre crg crm cro crp crr eaa eac eae eag eam eao eap ear ec- eca ecc ece ecg ecm eco ecr eea eec eee eeg eem eeo eep eer ega egc ege egg egm ego egp egr em- ema emc eme emg emm emo emp emr eo- eoa eoc eoe eog eom eoo eop eor ep- epa epc epe epg epm epo epp epr era erc ere erg erm ero erp err g-p gaa gac gae gag gam gao gap gar gca gcc gce gcg gcm gco gcp gcr ge- gea gec gee geg gem geo gep ger gga ggc ggg ggm ggo ggp ggr gma gmc gme gmg gmm gmo gmp gmr goa goc goe gog gom goo gop gor gpa gpc gpe gpg gpm gpo gpp gpr gra grc gre grg grm gro grp grr m-o m-r maa mac mae mag mam mao map mar mc- mca mcc mce mcg mcm mco mcp mcr mea mec mee meg mem meo mep mer mga mgc mge mgm mgo mgp mgr mma mmc mme mmg mmm mmo mmp mmr moa moc moe mog mom moo mop mor mpa mpc mpe mpg mpm mpo mpp mpr mra mrc mre mrg mrm mro mrp mrr oaa oac oae oag oam oao oap oar oc- oca occ ocg ocm oco ocp ocr oea oec oee oeg oem oeo oep oer oga ogc oge ogg ogo ogp om- oma omc ome omg omm omo omp omr oo- ooa ooc oog oom ooo oop oor op- opa opc ope opg opm opo opp opr or- ora orc ore org orm oro orp orr p-p paa pac pae pag pam pao pap par pca pcc pce pcg pcm pco pcp pcr pea pec pee peg pem peo pep per pga pgc pge pgg pgm pgo pgp pgr pma pmc pme pmg pmm pmo pmp pmr poa poc poe pog pom poo pop por ppa ppc ppe ppg ppm ppo ppp ppr pra prc pre prg prm pro prp prr ra- raa rac rae rag ram rao rap rar rca rcc rce rcg rcm rco rcp rcr re- rea rec ree reg rem reo rep rer rga rgc rge rgg rgo rgp rgr rma rmc rme rmg rmm rmo rmp rmr roa roc roe rog rom roo rop ror rpa rpc rpe rpg rpm rpo rpp rpr rra rrc rrg rrm rrp rrr