-er a-a a-c aaa aac aae aag aao aar aau aav ac- aca acc ace acg aco acr acu acv aea aec aee aeg aeo aer aeu aev ag- aga agc age agg ago agr agu agv aoa aoc aoe aog aoo aor aou aov ar- ara arc are arg aro arr aru arv au- aua auc aue aug auo aur auv av- ava avc ave avg avo avr avu c-- caa cac cae cag cao car cau cav cca ccc cce ccg cco ccr ccu ccv ce- cea cec cee ceg ceo cer ceu cev cga cgc cge cgg cgo cgr cgu cgv co- coa coc coe cog coo cor cou cov cra crc cre crg cro crr cru crv cua cuc cue cug cuo cur cuu cuv cva cvc cve cvg cvo cvr cvu cvv eaa eac eae eag eao ear eau eav ec- eca ecc ece ecg eco ecr ecu ecv eea eec eee eeg eeo eer eev ega egc ege egg ego egr egu eo- eoa eoc eoe eog eoo eor eou era erc ere erg ero err eru erv eu- eua euc eue eug eur euv eva evc eve evg evo evr evv gaa gac gae gag gao gar gau gav gca gcc gce gcg gco gcr gcu ge- gea gec gee geg geo ger geu gev gga ggc ggg ggo ggr ggu ggv goa goc goe gog goo gor gou gov gra grc gre grg gro grr gru grv gu- gua guc gue gug guo gur guu guv gva gvc gve gvg gvo gvr gvu oaa oac oae oag oao oar oau oav oc- oca occ ocg oco ocr ocu ocv oea oec oee oeg oeo oer oga ogc oge ogg ogo oo- ooa ooc oog ooo oor oov or- ora orc ore org oro orr oru orv ou- oua ouc oue ouo our ov- ova ovc ove ovo ovv ra- raa rac rae rag rao rar rau rav rca rcc rce rcg rco rcr rcu rcv re- rea rec ree reg reo rer reu rev rga rgc rge rgg rgo rgr rgv roa roc roe rog roo ror rou rov rra rrc rrg rrr rru rua ruc rue rug ruo rur ruu ruv rva rvc rve rvg rvo rvr rvu rvv ua- uaa uac uae uag uao uar uau uav uca ucc uce ucg uco ucr ucu ucv uea uec uee ueg uer uga ugc uge ugg ugo ugr ugu uoa uoc uoe uog uoo uor ur- ura urc ure urg uro urr uru uua uuc uue uug uur uuu uva uvc uve uvo uvu uvv v-a v-e vaa vac vae vag vao var vau vav vca vcc vce vco vcr vcu vea vec vee veg veo ver veu vga vgc vgg vgo vgr vgu voa voc voe vog voo vor vou vov vra vrc vre vrg vrr vru vue vug vur vuv vva vvc vvg vvo vvr vvv