-er -ic a-a a-c a-i a-t aaa aac aad aae aag aai aar aat ac- aca acc acd ace acg aci acr act ad- ada adc add ade adg adi adr adt aea aec aed aee aeg aei aer aet ag- aga agc agd age agg agi agr agt ai- aia aic aid aie aig aii air ait ar- ara arc ard are arg ari arr art at- ata atc atd ate atg ati atr att c-- caa cac cad cae cag cai car cat cca ccc ccd cce ccg cci ccr cct cda cdc cdd cde cdg cdi cdr cdt ce- cea cec ced cee ceg cei cer cet cga cgc cgd cge cgg cgi cgr cgt ci- cia cic cid cie cig cii cir cit cra crc crd cre crg cri crr crt cta ctc ctd cte ctg cti ctr ctt daa dac dad dae dag dai dar dat dca dcc dcd dce dcg dci dcr dct dda ddc ddd dde ddg ddi ddr ddt de- dea dec ded dee deg dei der det dga dgc dgd dge dgg dgi dgr dgt di- dia dic did die dig dii dir dit dra drc drd dre drg dri drr drt dta dtc dtd dte dtg dti dtr dtt eaa eac ead eae eag eai ear eat ec- eca ecc ecd ece ecg eci ecr ect ed- eda edc edd ede edg edi edr edt eea eec eed eee eeg eer eet ega egc egd ege egg egi egr egt eia eic eid eie eig eii eir eit era erc erd ere erg eri err ert eta etc etd ete etg eti etr ett g-d gaa gac gad gae gag gai gar gat gca gcc gcd gce gcg gci gcr gct gda gdc gdd gde gdi gdr gdt ge- gea gec ged gee geg gei ger get gga ggc ggd ggg ggi ggr ggt gia gic gid gie gig gii gir git gra grc grd gre grg gri grr grt gta gtc gtd gte gtg gti gtr gtt i-d ia- iaa iac iad iae iag iai iar iat ica icc icd ice icg ici icr ict ida idc idd ide idg idi idr idt ie- iea iec ied iee ieg iei ier iet iga igc igd ige igg igi igr igt iia iic iid iie iii iir iit ir- ira irc ird ire irg iri irr irt ita itc itd ite itg iti itt ra- raa rac rad rae rag rai rar rat rca rcc rcd rce rcg rci rcr rct rda rdc rdd rde rdg rdi rdr rdt re- rea rec red ree reg rei rer ret rga rgc rgd rge rgg rgi rgr rgt ria ric rid rie rig rii rir rit rra rrc rrd rrg rri rrr rrt rta rtc rtd rte rtg rti rtr rtt taa tac tad tae tag tai tar tat tca tcc tcd tce tcg tci tcr tct tda tdc tdd tde tdg tdi tdr tdt te- tea tec ted tee teg tei ter tet tga tgc tge tgg tgi tgr tgt tia tic tid tie tig tii tir tit tra trc trd tre trg tri trr trt tta ttc ttd tte ttg tti ttr ttt