a-a a-b a-i aaa aab aaf aai aan aay ab- aba abb abf abi abn aby af- afa afb aff afi afn afy ai- aia aib aif aii ain aiy an- ana anb anf ani ann any ay- aya ayf ayi ayn baa bab baf bai ban bay bba bbb bbf bbi bbn bby bfa bfb bff bfi bfn bfy bi- bia bib bif bii bin biy bna bnb bnf bni bnn by- bya byf byi byn faa fab faf fai fan fay fba fbb fbf fbi fbn ffa fff ffi ffn ffy fia fib fif fii fin fna fnb fnf fni fnn fy- fya fyb fyi fyn i-f ia- iaa iab iaf iai ian iba ibb ibf ibi ibn iby ifa ifb iff ifi ifn ify iia iib iif iii iin in- ina inb inf ini inn iny iya iyy n-i naa nab naf nai nan nay nba nbb nbf nbi nbn nfa nfb nff nfi nfn nia nib nif nii nin nna nnb nnf nni nnn nya nyf nyn nyy yaa yab yaf yai yan yay ybf ybi yby yfa yff yif yii yin yna ynn yny yyb yyf yyy