-er a-a a-c aaa aac aae aag aan aao aar aav ac- aca acc ace acg acn aco acr acv aea aec aee aeg aen aeo aer aev ag- aga agc age agg agn ago agr agv an- ana anc ane ang ann ano anr anv aoa aoc aoe aog aon aoo aor aov ar- ara arc are arg arn aro arr arv av- ava avc ave avg avn avo avr c-- caa cac cae cag can cao car cav cca ccc cce ccg ccn cco ccr ccv ce- cea cec cee ceg cen ceo cer cev cga cgc cge cgg cgn cgo cgr cgv cn- cna cnc cne cng cnn cno cnr cnv co- coa coc coe cog con coo cor cov cra crc cre crg crn cro crr crv cva cvc cve cvg cvn cvo cvr cvv eaa eac eae eag ean eao ear eav ec- eca ecc ece ecg ecn eco ecr ecv eea eec eee eeg een eeo eer eev ega egc ege egg egn ego egr en- ena enc ene eng enn eno enr env eo- eoa eoc eoe eog eon eoo eor era erc ere erg ern ero err erv eva evc eve evg evn evo evr evv gaa gac gae gag gan gao gar gav gca gcc gce gcg gcn gco gcr ge- gea gec gee geg gen geo ger gev gga ggc ggg ggn ggo ggr ggv gna gnc gne gnn gno gnr gnv goa goc goe gog gon goo gor gov gra grc gre grg grn gro grr grv gva gvc gve gvg gvn gvo gvr naa nac nae nag nan nao nar nav nca ncc nce ncg ncn nco ncr ncv ne- nea nec nee neg nen neo ner nev nga ngc nge ngg ngn ngo nna nnc nne nng nnn nno nnv no- noa noc noe nog non noo nor nov nra nrc nre nrg nrn nro nrr nrv nva nvc nve nvg nvn nvv oaa oac oae oag oan oao oar oav oc- oca occ ocg ocn oco ocr ocv oea oec oee oeg oen oeo oer oga ogc oge ogg ogn ogo on- ona onc one ong onn ono onr oo- ooa ooc oog oon ooo oor oov or- ora orc ore org orn oro orr orv ov- ova ovc ove ovo ovv ra- raa rac rae rag ran rao rar rav rca rcc rce rcg rcn rco rcr rcv re- rea rec ree reg ren reo rer rev rga rgc rge rgg rgn rgo rgr rgv rna rnc rng rnn rno rnr rnv roa roc roe rog ron roo ror rov rra rrc rrg rrn rrr rva rvc rve rvg rvn rvo rvr rvv v-a v-e vaa vac vae vag van vao var vav vca vcc vce vcn vco vcr vea vec vee veg ven veo ver vga vgc vgg vgn vgo vgr vn- vna vng vno vnr vnv voa voc voe vog von voo vor vov vra vrc vre vrg vrn vrr vva vvc vvg vvo vvr vvv