-er a-a a-t aaa aad aae aag aar aat aax ad- ada add ade adg adr adt adx aea aed aee aeg aer aet aex ag- aga agd age agg agr agt agx ar- ara ard are arg arr art arx at- ata atd ate atg atr att atx ax- axa axe axr axt axx daa dad dae dag dar dat dax dda ddd dde ddg ddr ddt ddx de- dea ded dee deg der det dex dga dgd dge dgg dgr dgt dra drd dre drg drr drt drx dta dtd dte dtg dtr dtt dtx dxd dxr dxt dxx eaa ead eae eag ear eat eax ed- eda edd ede edg edr edt edx eea eed eee eeg eer eet eex ega egd ege egg egr egt egx era erd ere erg err ert eta etd ete etg etr ett etx ex- exa exd exe exr ext exx g-d gaa gad gae gag gar gat gda gdd gde gdr gdt gdx ge- gea ged gee geg ger get gex gga ggd ggg ggr ggt gra grd gre grg grr grt grx gta gtd gte gtg gtr gtt gtx gxa gxt ra- raa rad rae rag rar rat rax rda rdd rde rdg rdr rdt rdx re- rea red ree reg rer ret rex rga rgd rge rgg rgr rgt rgx rra rrd rrg rrr rrt rta rtd rte rtg rtr rtt rtx rxr t-x taa tad tae tag tar tat tax tda tdd tde tdg tdr tdt tdx te- tea ted tee teg ter tet tex tga tge tgg tgr tgt tra trd tre trg trr trt trx tta ttd tte ttg ttr ttt ttx txe txt xaa xad xag xar xat xda xde xdr xdt xed xee xeg xer xet xex xge xrd xrt xrx xtr xtx xxx