-er a-a aaa aad aae aan aar aax ad- ada add ade adn adr adx aea aed aee aen aer aex an- ana and ane ann anr anx ar- ara ard are arn arr arx ax- axa axe axn axr axx daa dad dae dan dar dax dda ddd dde ddn ddr ddx de- dea ded dee den der dex dna dnd dne dnn dnr dra drd dre drn drr drx dxd dxn dxr dxx eaa ead eae ean ear eax ed- eda edd ede edn edr edx eea eed eee een eer eex en- ena end ene enn enr era erd ere ern err ex- exa exd exe exr exx naa nad nae nan nar nax nda ndd nde ndn ndr ne- nea ned nee nen ner nex nna nne nnn nra nrd nre nrn nrr nrx nxd ra- raa rad rae ran rar rax rda rdd rde rdn rdr rdx re- rea red ree ren rer rex rna rnd rnn rnr rra rrd rrn rrr rxr xaa xad xan xar xda xde xdr xed xee xen xer xex xna xrd xrx xxx