a-a a-q aaa aad aae aan aaq aax ad- ada add ade adn adq adx aea aed aee aen aeq aex an- ana and ane ann anq anx aqa aqn ax- axa axe axn axx daa dad dae dan daq dax dda ddd dde ddn ddq ddx de- dea ded dee den deq dex dna dnd dne dnn dnq dqa dqe dqn dxd dxn dxx eaa ead eae ean eax ed- eda edd ede edn edx eea eed eee een eex en- ena end ene enn eqa eqe eqn eqq ex- exa exd exe exx naa nad nae nan nax nda ndd nde ndn ne- nea ned nee nen nex nna nne nnn nxd qaa qad qan qax qda qed qee qen qex qnd qne qnx qqq qxe xaa xad xan xda xde xed xee xen xeq xex xna xxx