-er a-a a-t aaa aae aag aan aar aat aax aea aee aeg aen aer aet aex ag- aga age agg agn agr agt agx an- ana ane ang ann anr ant anx ar- ara are arg arn arr art arx at- ata ate atg atn atr att atx ax- axa axe axn axr axt axx eaa eae eag ean ear eat eax eea eee eeg een eer eet eex ega ege egg egn egr egt egx en- ena ene eng enn enr ent era ere erg ern err ert eta ete etg etn etr ett etx ex- exa exe exr ext exx gaa gae gag gan gar gat ge- gea gee geg gen ger get gex gga ggg ggn ggr ggt gna gne gnn gnr gnt gra gre grg grn grr grt grx gta gte gtg gtn gtr gtt gtx gxa gxt naa nae nag nan nar nat nax ne- nea nee neg nen ner net nex nga nge ngg ngn ngt nna nne nng nnn nnt nra nre nrg nrn nrr nrt nrx nta nte ntg ntn ntr ntt ntx nxt ra- raa rae rag ran rar rat rax re- rea ree reg ren rer ret rex rga rge rgg rgn rgr rgt rgx rna rng rnn rnr rnt rra rrg rrn rrr rrt rta rte rtg rtn rtr rtt rtx rxr t-x taa tae tag tan tar tat tax te- tea tee teg ten ter tet tex tga tge tgg tgn tgr tgt tna tne tng tnn tnr tnt tnx tra tre trg trn trr trt trx tta tte ttg ttn ttr ttt ttx txe txn txt xaa xag xan xar xat xee xeg xen xer xet xex xge xna xrt xrx xtr xtx xxx