-er -ic a-a a-c a-i a-t aaa aac aae aag aai aar aas aat ac- aca acc ace acg aci acr acs act aea aec aee aeg aei aer aes aet ag- aga agc age agg agi agr ags agt ai- aia aic aie aig aii air ais ait ar- ara arc are arg ari arr ars art as- asa asc ase asg asi asr ass ast at- ata atc ate atg ati atr ats att c-- caa cac cae cag cai car cas cat cca ccc cce ccg cci ccr ccs cct ce- cea cec cee ceg cei cer ces cet cga cgc cge cgg cgi cgr cgs cgt ci- cia cic cie cig cii cir cis cit cra crc cre crg cri crr crs crt csa csc cse csg csi csr css cst cta ctc cte ctg cti ctr cts ctt eaa eac eae eag eai ear eas eat ec- eca ecc ece ecg eci ecr ecs ect eea eec eee eeg eer ees eet ega egc ege egg egi egr egs egt eia eic eie eig eii eir eis eit era erc ere erg eri err ers ert es- esa esc ese esg esi esr ess est eta etc ete etg eti etr ets ett gaa gac gae gag gai gar gas gat gca gcc gce gcg gci gcr gcs gct ge- gea gec gee geg gei ger ges get gga ggc ggg ggi ggr ggs ggt gia gic gie gig gii gir gis git gra grc gre grg gri grr grs grt gsa gsc gse gsg gsi gsr gss gst gta gtc gte gtg gti gtr gts gtt ia- iaa iac iae iag iai iar ias iat ica icc ice icg ici icr ics ict ie- iea iec iee ieg iei ier ies iet iga igc ige igg igi igr igs igt iia iic iie iii iir iis iit ir- ira irc ire irg iri irr irs irt is- isa isc ise isg isi isr iss ist ita itc ite itg iti its itt ra- raa rac rae rag rai rar ras rat rca rcc rce rcg rci rcr rcs rct re- rea rec ree reg rei rer res ret rga rgc rge rgg rgi rgr rgs rgt ria ric rie rig rii rir ris rit rra rrc rrg rri rrr rrs rrt rsa rsc rse rsg rsi rsr rss rst rta rtc rte rtg rti rtr rts rtt saa sac sae sag sai sar sas sat sca scc sce scg sci scr scs sct se- sea sec see seg sei ser ses set sga sgc sge sgg sgi sgr sgs sgt sia sic sie sig sii sir sis sit sr- sra src sre srg sri srr srs srt ss- ssa ssc sse ssg ssi ssr sss sst sta stc ste stg sti str sts stt taa tac tae tag tai tar tas tat tca tcc tce tcg tci tcr tcs tct te- tea tec tee teg tei ter tes tet tga tgc tge tgg tgi tgr tgs tgt tia tic tie tig tii tir tis tit tra trc tre trg tri trr trs trt tsa tsc tse tsg tsi tsr tss tst tta ttc tte ttg tti ttr tts ttt