-er -ic a-a a-c a-i a-t aaa aac aae aag aai aao aar aat ac- aca acc ace acg aci aco acr act aea aec aee aeg aei aeo aer aet ag- aga agc age agg agi ago agr agt ai- aia aic aie aig aii aio air ait aoa aoc aoe aog aoi aoo aor aot ar- ara arc are arg ari aro arr art at- ata atc ate atg ati ato atr att c-- caa cac cae cag cai cao car cat cca ccc cce ccg cci cco ccr cct ce- cea cec cee ceg cei ceo cer cet cga cgc cge cgg cgi cgo cgr cgt ci- cia cic cie cig cii cio cir cit co- coa coc coe cog coi coo cor cot cra crc cre crg cri cro crr crt cta ctc cte ctg cti cto ctr ctt eaa eac eae eag eai eao ear eat ec- eca ecc ece ecg eci eco ecr ect eea eec eee eeg eeo eer eet ega egc ege egg egi ego egr egt eia eic eie eig eii eio eir eit eo- eoa eoc eoe eog eoi eoo eor eot era erc ere erg eri ero err ert eta etc ete etg eti eto etr ett gaa gac gae gag gai gao gar gat gca gcc gce gcg gci gco gcr gct ge- gea gec gee geg gei geo ger get gga ggc ggg ggi ggo ggr ggt gia gic gie gig gii gio gir git goa goc goe gog goi goo gor got gra grc gre grg gri gro grr grt gta gtc gte gtg gti gto gtr gtt ia- iaa iac iae iag iai iao iar iat ica icc ice icg ici ico icr ict ie- iea iec iee ieg iei ier iet iga igc ige igg igi igo igr igt iia iic iie iii iio iir iit io- ioa ioc ioe iog ioi ioo ior iot ir- ira irc ire irg iri iro irr irt ita itc ite itg iti ito itt o-i oaa oac oae oag oai oao oar oat oc- oca occ ocg oci oco ocr oct oea oec oee oeg oei oeo oer oet oga ogc oge ogg ogi ogo ogt oia oic oie oii oio oir oit oo- ooa ooc oog ooi ooo oor oot or- ora orc ore org ori oro orr ort ot- ota otc ote otg oti oto otr ott ra- raa rac rae rag rai rao rar rat rca rcc rce rcg rci rco rcr rct re- rea rec ree reg rei reo rer ret rga rgc rge rgg rgi rgo rgr rgt ria ric rie rig rii rio rir rit roa roc roe rog roi roo ror rot rra rrc rrg rri rrr rrt rta rtc rte rtg rti rto rtr rtt taa tac tae tag tai tao tar tat tca tcc tce tcg tci tco tcr tct te- tea tec tee teg tei teo ter tet tga tgc tge tgg tgi tgo tgr tgt tia tic tie tig tii tio tir tit to- toa toc toe tog toi too tor tot tra trc tre trg tri tro trr trt tta ttc tte ttg tti tto ttr ttt