a-a a-b a-i aaa aab aai aan aap aay ab- aba abb abi abn abp aby ai- aia aib aii ain aip aiy an- ana anb ani ann anp any ap- apa apb api apn app apy ay- aya ayi ayn ayp b-p baa bab bai ban bap bay bba bbb bbi bbn bbp bby bi- bia bib bii bin bip biy bna bnb bni bnn bnp bpa bpb bpi bpn bpp bpy by- bya byi byn byp ia- iaa iab iai ian iap iba ibb ibi ibn ibp iby iia iib iii iin iip in- ina inb ini inn inp iny ipa ipb ipi ipn ipp ipy iya iyy n-i naa nab nai nan nap nay nba nbb nbi nbn nbp nia nib nii nin nip nna nnb nni nnn nnp npa npb npi npn npp nya nyn nyp nyy p-p paa pab pai pan pap pay pba pbb pbi pbn pbp pby pia pib pii pin pip pn- pna pnb pni pnn pnp pny ppa ppb ppi ppn ppp py- pya pyb pyn yaa yab yai yan yap yay ybi ybp yby yii yin yip yna ynn ynp yny ypa yyb yyy