a-a a-b a-i a-z aaa aab aad aaf aai aaz ab- aba abb abd abf abi abz ad- ada adb add adf adi adz af- afa afb afd aff afi afz ai- aia aib aid aif aii aiz az- aza azb azd azf azi azz baa bab bad baf bai baz bba bbb bbd bbf bbi bda bdb bdd bdf bdi bdz bfa bfb bfd bff bfi bfz bi- bia bib bid bif bii biz bza bzd bzf bzz daa dab dad daf dai daz dba dbb dbd dbf dbi dbz dda ddb ddd ddf ddi ddz dfa dfb dfd dff dfi dfz di- dia dib did dif dii diz dza dzb dzd dzi faa fab fad faf fai faz fba fbb fbd fbf fbi fda fdb fdd fdf fdi ffa ffd fff ffi ffz fia fib fid fif fii fiz fzd i-d i-f ia- iaa iab iad iaf iai iaz iba ibb ibd ibf ibi ibz ida idb idd idf idi ifa ifb ifd iff ifi ifz iia iib iid iif iii iza izi izz zaa zab zad zaf zai zaz zbb zdf zfa zfd zia zib zid zif ziz zzz