-ic a-a a-b a-c a-i aaa aab aac aai aan aay ab- aba abb abc abi abn aby ac- aca acb acc aci acn acy ai- aia aib aic aii ain aiy an- ana anb anc ani ann any ay- aya ayc ayi ayn baa bab bac bai ban bay bba bbb bbc bbi bbn bby bca bcb bcc bci bcn bcy bi- bia bib bic bii bin biy bna bnb bnc bni bnn by- bya byc byi byn c-- caa cab cac cai can cay cba cbb cbc cbi cbn cby cca ccb ccc cci ccn ci- cia cib cic cii cin cn- cna cnb cnc cni cnn cny cya cyb cyc cyn ia- iaa iab iac iai ian iba ibb ibc ibi ibn iby ica icb icc ici icn icy iia iib iic iii iin in- ina inb inc ini inn iny iya iyc iyy n-i naa nab nac nai nan nay nba nbb nbc nbi nbn nca ncb ncc nci ncn nia nib nic nii nin nna nnb nnc nni nnn nya nyc nyn nyy yaa yab yac yai yan yay ybc ybi yby yca ycc yci ycy yii yin yna ynn yny yyb yyc yyy