a-a a-b a-i aaa aab aad aai aan aax ab- aba abb abd abi abn abx ad- ada adb add adi adn adx ai- aia aib aid aii ain aix an- ana anb and ani ann anx ax- axa axi axn axx baa bab bad bai ban bax bba bbb bbd bbi bbn bbx bda bdb bdd bdi bdx bi- bia bib bid bii bin bix bna bnb bnd bni bnn bnx bxb bxd bxi bxn bxx daa dab dad dai dan dax dba dbb dbd dbi dbn dbx dda ddb ddd ddi ddn ddx di- dia dib did dii din dix dna dnb dnd dni dnn dxd dxi dxn dxx i-d ia- iaa iab iad iai ian iba ibb ibd ibi ibn ibx ida idb idd idi idn idx iia iib iid iii iin iix in- ina inb ind ini inn inx ixi ixn n-i naa nab nad nai nan nax nba nbb nbd nbi nbn nbx nda ndb ndd ndi ndn nia nib nid nii nin nix nna nnb nni nnn nxd xaa xad xan xbx xda xdb xdi xia xii xin xix xna xxi xxx