-er -th a-a a-c a-t aaa aac aae aag aah aan aar aat aax ac- aca acc ace acg ach acn acr act acx aea aec aee aeg aeh aen aer aet aex ag- aga agc age agg agh agn agr agt agx aha ahc ahe ahg ahh ahn ahr aht ahx an- ana anc ane ang anh ann anr ant anx ar- ara arc are arg arh arn arr art arx at- ata atc ate atg ath atn atr att atx ax- axa axe axh axn axr axt axx c-- caa cac cae cag cah can car cat cax cca ccc cce ccg cch ccn ccr cct ccx ce- cea cec cee ceg ceh cen cer cet cex cga cgc cge cgg cgh cgn cgr cgt ch- cha chc che chg chh chn chr cht chx cn- cna cnc cne cng cnh cnn cnr cnt cnx cra crc cre crg crh crn crr crt crx cta ctc cte ctg cth ctn ctr ctt ctx cxc cxh cxr cxt cxx eaa eac eae eag eah ean ear eat eax ec- eca ecc ece ecg ech ecn ecr ect ecx eea eec eee eeg een eer eet eex ega egc ege egg egh egn egr egt egx eha ehc ehe ehg ehh ehn ehr eht en- ena enc ene eng enh enn enr ent era erc ere erg erh ern err ert eta etc ete etg eth etn etr ett etx ex- exa exc exe exh exr ext exx gaa gac gae gag gah gan gar gat gca gcc gce gcg gch gcn gcr gct ge- gea gec gee geg geh gen ger get gex gga ggc ggg ggh ggn ggr ggt gha ghc ghe ghg ghh ghn ghr ght gna gnc gne gnn gnr gnt gra grc gre grg grh grn grr grt grx gta gtc gte gtg gth gtn gtr gtt gtx gxa gxt haa hac hae hag hah han har hat hax hca hcc hce hcg hch hcn hcr hct he- hea hec hee heg heh hen her het hex hga hgc hge hgg hgh hgn hgr hgt hha hhc hhe hhg hhh hhn hhr hht hna hnc hne hng hnh hnn hnt hr- hra hrc hre hrg hrh hrn hrr hrt hta htc hte htg hth htn htr htt htx hxc naa nac nae nag nah nan nar nat nax nca ncc nce ncg nch ncn ncr nct ncx ne- nea nec nee neg neh nen ner net nex nga ngc nge ngg ngh ngn ngt nha nhc nhe nhg nhh nhn nhr nht nna nnc nne nng nnh nnn nnt nra nrc nre nrg nrn nrr nrt nrx nta ntc nte ntg nth ntn ntr ntt ntx nxc nxt ra- raa rac rae rag rah ran rar rat rax rca rcc rce rcg rch rcn rcr rct rcx re- rea rec ree reg reh ren rer ret rex rga rgc rge rgg rgh rgn rgr rgt rgx rh- rha rhc rhe rhg rhh rhn rhr rht rna rnc rng rnh rnn rnr rnt rra rrc rrg rrh rrn rrr rrt rta rtc rte rtg rtn rtr rtt rtx rxr t-x taa tac tae tag tah tan tar tat tax tca tcc tce tcg tch tcn tcr tct tcx te- tea tec tee teg teh ten ter tet tex tga tgc tge tgg tgh tgn tgr tgt th- tha thc the thg thh thn thr tht thx tna tnc tne tng tnh tnn tnr tnt tnx tra trc tre trg trh trn trr trt trx tta ttc tte ttg tth ttn ttr ttt ttx txe txn txt xaa xac xag xan xar xat xch xcr xcx xee xeg xen xer xet xex xge xht xna xnc xrc xrt xrx xtc xtr xtx xxx