-er -ic a-a a-c a-i a-t aaa aac aae aag aai aan aar aat aax ac- aca acc ace acg aci acn acr act acx aea aec aee aeg aei aen aer aet aex ag- aga agc age agg agi agn agr agt agx ai- aia aic aie aig aii ain air ait aix an- ana anc ane ang ani ann anr ant anx ar- ara arc are arg ari arn arr art arx at- ata atc ate atg ati atn atr att atx ax- axa axe axi axn axr axt axx c-- caa cac cae cag cai can car cat cax cca ccc cce ccg cci ccn ccr cct ccx ce- cea cec cee ceg cei cen cer cet cex cga cgc cge cgg cgi cgn cgr cgt ci- cia cic cie cig cii cin cir cit cix cn- cna cnc cne cng cni cnn cnr cnt cnx cra crc cre crg cri crn crr crt crx cta ctc cte ctg cti ctn ctr ctt ctx cxc cxi cxr cxt cxx eaa eac eae eag eai ean ear eat eax ec- eca ecc ece ecg eci ecn ecr ect ecx eea eec eee eeg een eer eet eex ega egc ege egg egi egn egr egt egx eia eic eie eig eii ein eir eit eix en- ena enc ene eng eni enn enr ent era erc ere erg eri ern err ert eta etc ete etg eti etn etr ett etx ex- exa exc exe exi exr ext exx gaa gac gae gag gai gan gar gat gca gcc gce gcg gci gcn gcr gct ge- gea gec gee geg gei gen ger get gex gga ggc ggg ggi ggn ggr ggt gia gic gie gig gii gin gir git gna gnc gne gni gnn gnr gnt gra grc gre grg gri grn grr grt grx gta gtc gte gtg gti gtn gtr gtt gtx gxa gxt ia- iaa iac iae iag iai ian iar iat ica icc ice icg ici icn icr ict ie- iea iec iee ieg iei ien ier iet iex iga igc ige igg igi ign igr igt iia iic iie iii iin iir iit iix in- ina inc ine ing ini inn inr int inx ir- ira irc ire irg iri irn irr irt irx ita itc ite itg iti itn itt itx ixc ixe ixi ixn n-i naa nac nae nag nai nan nar nat nax nca ncc nce ncg nci ncn ncr nct ncx ne- nea nec nee neg nei nen ner net nex nga ngc nge ngg ngi ngn ngt nia nic nie nig nii nin nir nit nix nna nnc nne nng nni nnn nnt nra nrc nre nrg nri nrn nrr nrt nrx nta ntc nte ntg nti ntn ntr ntt ntx nxc nxt ra- raa rac rae rag rai ran rar rat rax rca rcc rce rcg rci rcn rcr rct rcx re- rea rec ree reg rei ren rer ret rex rga rgc rge rgg rgi rgn rgr rgt rgx ria ric rie rig rii rin rir rit rix rna rnc rng rni rnn rnr rnt rra rrc rrg rri rrn rrr rrt rta rtc rte rtg rti rtn rtr rtt rtx rxr t-x taa tac tae tag tai tan tar tat tax tca tcc tce tcg tci tcn tcr tct tcx te- tea tec tee teg tei ten ter tet tex tga tgc tge tgg tgi tgn tgr tgt tia tic tie tig tii tin tir tit tix tna tnc tne tng tni tnn tnr tnt tnx tra trc tre trg tri trn trr trt trx tta ttc tte ttg tti ttn ttr ttt ttx txe txi txn txt xaa xac xag xan xar xat xci xcr xcx xee xeg xen xer xet xex xge xgi xia xic xie xii xin xit xix xna xnc xrc xrt xrx xtc xti xtr xtx xxi xxx