-er a-a a-c a-t aaa aac aae aag aak aan aar aat ac- aca acc ace acg ack acn acr act aea aec aee aeg aek aen aer aet ag- aga agc age agg agk agn agr agt aka akc ake akg akk akn akr an- ana anc ane ang ank ann anr ant ar- ara arc are arg ark arn arr art at- ata atc ate atg atn atr att c-- caa cac cae cag cak can car cat cca ccc cce ccg cck ccn ccr cct ce- cea cec cee ceg cek cen cer cet cga cgc cge cgg cgn cgr cgt cka ckc ckt cn- cna cnc cne cng cnn cnr cnt cra crc cre crg crk crn crr crt cta ctc cte ctg ctk ctn ctr ctt eaa eac eae eag eak ean ear eat ec- eca ecc ece ecg eck ecn ecr ect eea eec eee eeg eek een eer eet ega egc ege egg egn egr egt eka ekc eke ekg ekr ekt en- ena enc ene eng enk enn enr ent era erc ere erg erk ern err ert eta etc ete etg etk etn etr ett gaa gac gae gag gak gan gar gat gca gcc gce gcg gck gcn gcr gct ge- gea gec gee geg gek gen ger get gga ggc ggg ggn ggr ggt gka gkn gkt gna gnc gne gnn gnr gnt gra grc gre grg grk grn grr grt gta gtc gte gtg gtk gtn gtr gtt k-t ka- kaa kac kae kag kak kan kar kat kca kcc kce kcg kck kcn kcr kct ke- kea kec kee keg kek ken ker ket kga kgc kkc kke kkk kkn kkr kkt kn- kna knc kne kng knk knn knr knt kra krc krg krk krn krr krt kta ktc kte ktg ktk ktn ktr ktt naa nac nae nag nak nan nar nat nca ncc nce ncg nck ncn ncr nct ne- nea nec nee neg nek nen ner net nga ngc nge ngg ngk ngn ngt nka nkc nke nkk nkn nkr nkt nna nnc nne nng nnk nnn nnt nra nrc nre nrg nrk nrn nrr nrt nta ntc nte ntg ntk ntn ntr ntt ra- raa rac rae rag rak ran rar rat rca rcc rce rcg rcn rcr rct re- rea rec ree reg rek ren rer ret rga rgc rge rgg rgk rgn rgr rgt rkc rke rkg rkk rkt rna rnc rng rnn rnr rnt rra rrc rrg rrk rrn rrr rrt rta rtc rte rtg rtk rtn rtr rtt taa tac tae tag tak tan tar tat tca tcc tce tcg tck tcn tcr tct te- tea tec tee teg tek ten ter tet tga tgc tge tgg tgk tgn tgr tgt tka tkc tke tkg tkk tkr tkt tna tnc tne tng tnk tnn tnr tnt tra trc tre trg trk trn trr trt tta ttc tte ttg ttk ttn ttr ttt