-er a-a a-c aaa aac aae aag aan aar aav ac- aca acc ace acg acn acr acv aea aec aee aeg aen aer aev ag- aga agc age agg agn agr agv an- ana anc ane ang ann anr anv ar- ara arc are arg arn arr arv av- ava avc ave avg avn avr c-- caa cac cae cag can car cav cca ccc cce ccg ccn ccr ccv ce- cea cec cee ceg cen cer cev cga cgc cge cgg cgn cgr cgv cn- cna cnc cne cng cnn cnr cnv cra crc cre crg crn crr crv cva cvc cve cvg cvn cvr cvv eaa eac eae eag ean ear eav ec- eca ecc ece ecg ecn ecr ecv eea eec eee eeg een eer eev ega egc ege egg egn egr en- ena enc ene eng enn enr env era erc ere erg ern err erv eva evc eve evg evn evr evv gaa gac gae gag gan gar gav gca gcc gce gcg gcn gcr ge- gea gec gee geg gen ger gev gga ggc ggg ggn ggr ggv gna gnc gne gnn gnr gnv gra grc gre grg grn grr grv gva gvc gve gvg gvn gvr naa nac nae nag nan nar nav nca ncc nce ncg ncn ncr ncv ne- nea nec nee neg nen ner nev nga ngc nge ngg ngn nna nnc nne nng nnn nnv nra nrc nre nrg nrn nrr nrv nva nvc nve nvg nvn nvv ra- raa rac rae rag ran rar rav rca rcc rce rcg rcn rcr rcv re- rea rec ree reg ren rer rev rga rgc rge rgg rgn rgr rgv rna rnc rng rnn rnr rnv rra rrc rrg rrn rrr rva rvc rve rvg rvn rvr rvv v-a v-e vaa vac vae vag van var vav vca vcc vce vcn vcr vea vec vee veg ven ver vga vgc vgg vgn vgr vn- vna vng vnr vnv vra vrc vre vrg vrn vrr vva vvc vvg vvr vvv