-er -ic a-a a-c a-i a-t aaa aac aae aag aai aar aat ac- aca acc ace acg aci acr act aea aec aee aeg aei aer aet ag- aga agc age agg agi agr agt ai- aia aic aie aig aii air ait ar- ara arc are arg ari arr art at- ata atc ate atg ati atr att c-- caa cac cae cag cai car cat cca ccc cce ccg cci ccr cct ce- cea cec cee ceg cei cer cet cga cgc cge cgg cgi cgr cgt ci- cia cic cie cig cii cir cit cra crc cre crg cri crr crt cta ctc cte ctg cti ctr ctt eaa eac eae eag eai ear eat ec- eca ecc ece ecg eci ecr ect eea eec eee eeg eer eet ega egc ege egg egi egr egt eia eic eie eig eii eir eit era erc ere erg eri err ert eta etc ete etg eti etr ett gaa gac gae gag gai gar gat gca gcc gce gcg gci gcr gct ge- gea gec gee geg gei ger get gga ggc ggg ggi ggr ggt gia gic gie gig gii gir git gra grc gre grg gri grr grt gta gtc gte gtg gti gtr gtt ia- iaa iac iae iag iai iar iat ica icc ice icg ici icr ict ie- iea iec iee ieg iei ier iet iga igc ige igg igi igr igt iia iic iie iii iir iit ir- ira irc ire irg iri irr irt ita itc ite itg iti itt ra- raa rac rae rag rai rar rat rca rcc rce rcg rci rcr rct re- rea rec ree reg rei rer ret rga rgc rge rgg rgi rgr rgt ria ric rie rig rii rir rit rra rrc rrg rri rrr rrt rta rtc rte rtg rti rtr rtt taa tac tae tag tai tar tat tca tcc tce tcg tci tcr tct te- tea tec tee teg tei ter tet tga tgc tge tgg tgi tgr tgt tia tic tie tig tii tir tit tra trc tre trg tri trr trt tta ttc tte ttg tti ttr ttt