a-a a-b a-i aaa aab aaf aai aam aan ab- aba abb abf abi abm abn af- afa afb aff afi afm afn ai- aia aib aif aii aim ain ama amb amf ami amm amn an- ana anb anf ani anm ann baa bab baf bai bam ban bba bbb bbf bbi bbm bbn bfa bfb bff bfi bfm bfn bi- bia bib bif bii bim bin bma bmb bmf bmi bmm bmn bna bnb bnf bni bnn faa fab faf fai fam fan fba fbb fbf fbi fbm fbn ffa fff ffi ffm ffn fia fib fif fii fim fin fma fmb fmf fmi fmm fmn fna fnb fnf fni fnm fnn i-f ia- iaa iab iaf iai iam ian iba ibb ibf ibi ibm ibn ifa ifb iff ifi ifm ifn iia iib iif iii iim iin im- ima imb imf imi imm imn in- ina inb inf ini inm inn m-f maa mab maf mai mam man mba mbb mbf mbi mbm mfa mfb mff mfi mfm mfn mi- mia mib mif mii mim min mma mmb mmf mmi mmm mmn mna mnb mnf mni mnm mnn n-i naa nab naf nai nam nan nba nbb nbf nbi nbm nbn nfa nfb nff nfi nfn nia nib nif nii nim nin nma nmb nmi nmm nmn nna nnb nnf nni nnm nnn