-er a-a aaa aad aae aao aar aax ad- ada add ade ado adr adx aea aed aee aeo aer aex aoa aod aoe aoo aor aox ar- ara ard are aro arr arx ax- axa axe axo axr axx daa dad dae dao dar dax dda ddd dde ddo ddr ddx de- dea ded dee deo der dex doa dod doe doo dor dox dra drd dre dro drr drx dxd dxo dxr dxx eaa ead eae eao ear eax ed- eda edd ede edo edr edx eea eed eee eeo eer eex eo- eoa eod eoe eoo eor era erd ere ero err ex- exa exd exe exo exr exx oaa oad oae oao oar oax oda odd ode odo odr oea oed oee oeo oer oex oo- ooa ood ooo oor oox or- ora ord ore oro orr orx ox- oxa oxo oxx ra- raa rad rae rao rar rax rda rdd rde rdo rdr rdx re- rea red ree reo rer rex roa rod roe roo ror rox rra rrd rrr rxr xaa xad xar xda xde xdr xed xee xer xex xoa xod xoo xor xox xrd xrx xxo xxx