-er a-a a-c a-t aaa aac aae aag aan aar aat aav aax ac- aca acc ace acg acn acr act acv acx aea aec aee aeg aen aer aet aev aex ag- aga agc age agg agn agr agt agv agx an- ana anc ane ang ann anr ant anv anx ar- ara arc are arg arn arr art arv arx at- ata atc ate atg atn atr att atv atx av- ava avc ave avg avn avr avt avx ax- axa axe axn axr axt axv axx c-- caa cac cae cag can car cat cav cax cca ccc cce ccg ccn ccr cct ccv ccx ce- cea cec cee ceg cen cer cet cev cex cga cgc cge cgg cgn cgr cgt cgv cn- cna cnc cne cng cnn cnr cnt cnv cnx cra crc cre crg crn crr crt crv crx cta ctc cte ctg ctn ctr ctt ctv ctx cva cvc cve cvg cvn cvr cvt cvv cvx cxc cxr cxt cxv cxx eaa eac eae eag ean ear eat eav eax ec- eca ecc ece ecg ecn ecr ect ecv ecx eea eec eee eeg een eer eet eev eex ega egc ege egg egn egr egt egx en- ena enc ene eng enn enr ent env era erc ere erg ern err ert erv eta etc ete etg etn etr ett etv etx eva evc eve evg evn evr evt evv ex- exa exc exe exr ext exx gaa gac gae gag gan gar gat gav gca gcc gce gcg gcn gcr gct ge- gea gec gee geg gen ger get gev gex gga ggc ggg ggn ggr ggt ggv gna gnc gne gnn gnr gnt gnv gra grc gre grg grn grr grt grv grx gta gtc gte gtg gtn gtr gtt gtv gtx gva gvc gve gvg gvn gvr gvt gxa gxt naa nac nae nag nan nar nat nav nax nca ncc nce ncg ncn ncr nct ncv ncx ne- nea nec nee neg nen ner net nev nex nga ngc nge ngg ngn ngt nna nnc nne nng nnn nnt nnv nra nrc nre nrg nrn nrr nrt nrv nrx nta ntc nte ntg ntn ntr ntt ntv ntx nva nvc nve nvg nvn nvt nvv nxc nxt nxv ra- raa rac rae rag ran rar rat rav rax rca rcc rce rcg rcn rcr rct rcv rcx re- rea rec ree reg ren rer ret rev rex rga rgc rge rgg rgn rgr rgt rgv rgx rna rnc rng rnn rnr rnt rnv rra rrc rrg rrn rrr rrt rta rtc rte rtg rtn rtr rtt rtv rtx rva rvc rve rvg rvn rvr rvt rvv rxr t-x taa tac tae tag tan tar tat tav tax tca tcc tce tcg tcn tcr tct tcv tcx te- tea tec tee teg ten ter tet tev tex tga tgc tge tgg tgn tgr tgt tgv tna tnc tne tng tnn tnr tnt tnx tra trc tre trg trn trr trt trv trx tta ttc tte ttg ttn ttr ttt ttv ttx tva tvc tve tvg tvn tvr tvt tvx txe txn txt v-a v-e vaa vac vae vag van var vat vav vax vca vcc vce vcn vcr vct vcx vea vec vee veg ven ver vet vex vga vgc vgg vgn vgr vgt vgx vn- vna vng vnr vnv vra vrc vre vrg vrn vrr vrt vta vtc vte vtg vtr vtt vtv vtx vva vvc vvg vvr vvt vvv vxa vxr vxv xaa xac xag xan xar xat xav xcr xcv xcx xee xeg xen xer xet xev xex xge xna xnc xrc xrt xrx xtc xtr xtv xtx xvg xvt xxv xxx