-er -ic a-a a-c a-i a-t aaa aac aae aag aai aao aar aas aat ac- aca acc ace acg aci aco acr acs act aea aec aee aeg aei aeo aer aes aet ag- aga agc age agg agi ago agr ags agt ai- aia aic aie aig aii aio air ais ait aoa aoc aoe aog aoi aoo aor aos aot ar- ara arc are arg ari aro arr ars art as- asa asc ase asg asi aso asr ass ast at- ata atc ate atg ati ato atr ats att c-- caa cac cae cag cai cao car cas cat cca ccc cce ccg cci cco ccr ccs cct ce- cea cec cee ceg cei ceo cer ces cet cga cgc cge cgg cgi cgo cgr cgs cgt ci- cia cic cie cig cii cio cir cis cit co- coa coc coe cog coi coo cor cos cot cra crc cre crg cri cro crr crs crt csa csc cse csg csi cso csr css cst cta ctc cte ctg cti cto ctr cts ctt eaa eac eae eag eai eao ear eas eat ec- eca ecc ece ecg eci eco ecr ecs ect eea eec eee eeg eeo eer ees eet ega egc ege egg egi ego egr egs egt eia eic eie eig eii eio eir eis eit eo- eoa eoc eoe eog eoi eoo eor eos eot era erc ere erg eri ero err ers ert es- esa esc ese esg esi eso esr ess est eta etc ete etg eti eto etr ets ett gaa gac gae gag gai gao gar gas gat gca gcc gce gcg gci gco gcr gcs gct ge- gea gec gee geg gei geo ger ges get gga ggc ggg ggi ggo ggr ggs ggt gia gic gie gig gii gio gir gis git goa goc goe gog goi goo gor gos got gra grc gre grg gri gro grr grs grt gsa gsc gse gsg gsi gso gsr gss gst gta gtc gte gtg gti gto gtr gts gtt ia- iaa iac iae iag iai iao iar ias iat ica icc ice icg ici ico icr ics ict ie- iea iec iee ieg iei ier ies iet iga igc ige igg igi igo igr igs igt iia iic iie iii iio iir iis iit io- ioa ioc ioe iog ioi ioo ior ios iot ir- ira irc ire irg iri iro irr irs irt is- isa isc ise isg isi iso isr iss ist ita itc ite itg iti ito its itt o-i oaa oac oae oag oai oao oar oas oat oc- oca occ ocg oci oco ocr ocs oct oea oec oee oeg oei oeo oer oes oet oga ogc oge ogg ogi ogo ogs ogt oia oic oie oii oio oir ois oit oo- ooa ooc oog ooi ooo oor oos oot or- ora orc ore org ori oro orr ors ort os- osa osc ose osg osi oso osr oss ost ot- ota otc ote otg oti oto otr ots ott ra- raa rac rae rag rai rao rar ras rat rca rcc rce rcg rci rco rcr rcs rct re- rea rec ree reg rei reo rer res ret rga rgc rge rgg rgi rgo rgr rgs rgt ria ric rie rig rii rio rir ris rit roa roc roe rog roi roo ror ros rot rra rrc rrg rri rrr rrs rrt rsa rsc rse rsg rsi rso rsr rss rst rta rtc rte rtg rti rto rtr rts rtt saa sac sae sag sai sao sar sas sat sca scc sce scg sci sco scr scs sct se- sea sec see seg sei seo ser ses set sga sgc sge sgg sgi sgo sgr sgs sgt sia sic sie sig sii sio sir sis sit soa soc soe sog soi soo sor sos sot sr- sra src sre srg sri sro srr srs srt ss- ssa ssc sse ssg ssi sso ssr sss sst sta stc ste stg sti sto str sts stt taa tac tae tag tai tao tar tas tat tca tcc tce tcg tci tco tcr tcs tct te- tea tec tee teg tei teo ter tes tet tga tgc tge tgg tgi tgo tgr tgs tgt tia tic tie tig tii tio tir tis tit to- toa toc toe tog toi too tor tos tot tra trc tre trg tri tro trr trs trt tsa tsc tse tsg tsi tso tsr tss tst tta ttc tte ttg tti tto ttr tts ttt