a-a a-b a-i aaa aab aae aaf aai aam ab- aba abb abe abf abi abm aea aeb aee aef aei aem af- afa afb afe aff afi afm ai- aia aib aie aif aii aim ama amb ame amf ami amm baa bab bae baf bai bam bba bbb bbe bbf bbi bbm be- bea beb bee bef bei bem bfa bfb bfe bff bfi bfm bi- bia bib bie bif bii bim bma bmb bme bmf bmi bmm eaa eab eae eaf eai eam eba ebb ebe ebf ebi ebm eea eeb eee eef eem ef- efa efb efe eff efi efm eia eib eie eif eii eim em- ema emb eme emf emi emm faa fab fae faf fai fam fba fbb fbe fbf fbi fbm fea feb fee fef fei fem ffa ffe fff ffi ffm fia fib fie fif fii fim fma fmb fme fmf fmi fmm i-f ia- iaa iab iae iaf iai iam iba ibb ibe ibf ibi ibm ie- iea iee ief iei iem ifa ifb ife iff ifi ifm iia iib iie iif iii iim im- ima imb ime imf imi imm m-f maa mab mae maf mai mam mba mbb mbe mbf mbi mbm mea meb mee mef mei mem mfa mfb mfe mff mfi mfm mi- mia mib mie mif mii mim mma mmb mme mmf mmi mmm