-er a-a a-i aaa aad aae aag aai aar aax ad- ada add ade adg adi adr adx aea aed aee aeg aei aer aex ag- aga agd age agg agi agr agx ai- aia aid aie aig aii air aix ar- ara ard are arg ari arr arx ax- axa axe axi axr axx daa dad dae dag dai dar dax dda ddd dde ddg ddi ddr ddx de- dea ded dee deg dei der dex dga dgd dge dgg dgi dgr di- dia did die dig dii dir dix dra drd dre drg dri drr drx dxd dxi dxr dxx eaa ead eae eag eai ear eax ed- eda edd ede edg edi edr edx eea eed eee eeg eer eex ega egd ege egg egi egr egx eia eid eie eig eii eir eix era erd ere erg eri err ex- exa exd exe exi exr exx g-d gaa gad gae gag gai gar gda gdd gde gdi gdr gdx ge- gea ged gee geg gei ger gex gga ggd ggg ggi ggr gia gid gie gig gii gir gra grd gre grg gri grr grx gxa i-d ia- iaa iad iae iag iai iar ida idd ide idg idi idr idx ie- iea ied iee ieg iei ier iex iga igd ige igg igi igr iia iid iie iii iir iix ir- ira ird ire irg iri irr irx ixe ixi ra- raa rad rae rag rai rar rax rda rdd rde rdg rdi rdr rdx re- rea red ree reg rei rer rex rga rgd rge rgg rgi rgr rgx ria rid rie rig rii rir rix rra rrd rrg rri rrr rxr xaa xad xag xar xda xde xdi xdr xed xee xeg xer xex xge xgi xia xie xii xix xrd xrx xxi xxx