a-a a-b a-i a-t aaa aab aae aai aan aas aat ab- aba abb abe abi abn abs abt aea aeb aee aei aen aes aet ai- aia aib aie aii ain ais ait an- ana anb ane ani ann ans ant as- asa asb ase asi asn ass ast at- ata atb ate ati atn ats att baa bab bae bai ban bas bat bba bbb bbe bbi bbn bbs bbt be- bea beb bee bei ben bes bet bi- bia bib bie bii bin bis bit bna bnb bne bni bnn bns bnt bsa bsb bse bsi bsn bss bst bta btb bte bti btn bts btt eaa eab eae eai ean eas eat eba ebb ebe ebi ebn ebs ebt eea eeb eee een ees eet eia eib eie eii ein eis eit en- ena enb ene eni enn ens ent es- esa esb ese esi esn ess est eta etb ete eti etn ets ett ia- iaa iab iae iai ian ias iat iba ibb ibe ibi ibn ibs ibt ie- iea iee iei ien ies iet iia iib iie iii iin iis iit in- ina inb ine ini inn ins int is- isa isb ise isi isn iss ist ita itb ite iti itn its itt n-i naa nab nae nai nan nas nat nba nbb nbe nbi nbn nbs nbt ne- nea neb nee nei nen nes net nia nib nie nii nin nis nit nna nnb nne nni nnn nns nnt nsa nsb nse nsi nsn nss nst nta ntb nte nti ntn nts ntt saa sab sae sai san sas sat sba sbb sbe sbi sbn sbs sbt se- sea seb see sei sen ses set sia sib sie sii sin sis sit sna snb sne sni snn sns snt ss- ssa ssb sse ssi ssn sss sst sta stb ste sti stn sts stt taa tab tae tai tan tas tat tba tbb tbe tbi tbn tbs tbt te- tea teb tee tei ten tes tet tia tib tie tii tin tis tit tna tnb tne tni tnn tns tnt tsa tsb tse tsi tsn tss tst tta ttb tte tti ttn tts ttt