-er a-a a-c aaa aac aae aag aam aan aao aar ac- aca acc ace acg acm acn aco acr aea aec aee aeg aem aen aeo aer ag- aga agc age agg agm agn ago agr ama amc ame amg amm amn amo amr an- ana anc ane ang anm ann ano anr aoa aoc aoe aog aom aon aoo aor ar- ara arc are arg arm arn aro arr c-- caa cac cae cag cam can cao car cca ccc cce ccg ccm ccn cco ccr ce- cea cec cee ceg cem cen ceo cer cga cgc cge cgg cgm cgn cgo cgr cma cmc cme cmg cmm cmn cmo cmr cn- cna cnc cne cng cnm cnn cno cnr co- coa coc coe cog com con coo cor cra crc cre crg crm crn cro crr eaa eac eae eag eam ean eao ear ec- eca ecc ece ecg ecm ecn eco ecr eea eec eee eeg eem een eeo eer ega egc ege egg egm egn ego egr em- ema emc eme emg emm emn emo emr en- ena enc ene eng enm enn eno enr eo- eoa eoc eoe eog eom eon eoo eor era erc ere erg erm ern ero err gaa gac gae gag gam gan gao gar gca gcc gce gcg gcm gcn gco gcr ge- gea gec gee geg gem gen geo ger gga ggc ggg ggm ggn ggo ggr gma gmc gme gmg gmm gmn gmo gmr gna gnc gne gnm gnn gno gnr goa goc goe gog gom gon goo gor gra grc gre grg grm grn gro grr m-o m-r maa mac mae mag mam man mao mar mc- mca mcc mce mcg mcm mcn mco mcr mea mec mee meg mem men meo mer mga mgc mge mgm mgn mgo mgr mma mmc mme mmg mmm mmn mmo mmr mna mnc mne mng mnm mnn mno mnr moa moc moe mog mom mon moo mor mra mrc mre mrg mrm mrn mro mrr naa nac nae nag nam nan nao nar nca ncc nce ncg ncm ncn nco ncr ne- nea nec nee neg nem nen neo ner nga ngc nge ngg ngm ngn ngo nma nmc nme nmg nmm nmn nmo nmr nna nnc nne nng nnm nnn nno no- noa noc noe nog nom non noo nor nra nrc nre nrg nrm nrn nro nrr oaa oac oae oag oam oan oao oar oc- oca occ ocg ocm ocn oco ocr oea oec oee oeg oem oen oeo oer oga ogc oge ogg ogn ogo om- oma omc ome omg omm omn omo omr on- ona onc one ong onn ono onr oo- ooa ooc oog oom oon ooo oor or- ora orc ore org orm orn oro orr ra- raa rac rae rag ram ran rao rar rca rcc rce rcg rcm rcn rco rcr re- rea rec ree reg rem ren reo rer rga rgc rge rgg rgn rgo rgr rma rmc rme rmg rmm rmn rmo rmr rna rnc rng rnm rnn rno rnr roa roc roe rog rom ron roo ror rra rrc rrg rrm rrn rrr