a-a a-b a-i a-t aaa aab aad aae aaf aai aas aat ab- aba abb abd abe abf abi abs abt ad- ada adb add ade adf adi ads adt aea aeb aed aee aef aei aes aet af- afa afb afd afe aff afi afs aft ai- aia aib aid aie aif aii ais ait as- asa asb asd ase asf asi ass ast at- ata atb atd ate atf ati ats att baa bab bad bae baf bai bas bat bba bbb bbd bbe bbf bbi bbs bbt bda bdb bdd bde bdf bdi bds bdt be- bea beb bed bee bef bei bes bet bfa bfb bfd bfe bff bfi bfs bft bi- bia bib bid bie bif bii bis bit bsa bsb bsd bse bsf bsi bss bst bta btb btd bte btf bti bts btt daa dab dad dae daf dai das dat dba dbb dbd dbe dbf dbi dbs dbt dda ddb ddd dde ddf ddi dds ddt de- dea deb ded dee def dei des det dfa dfb dfd dfe dff dfi dfs dft di- dia dib did die dif dii dis dit dsa dsb dsd dse dsf dsi dss dst dta dtb dtd dte dtf dti dts dtt eaa eab ead eae eaf eai eas eat eba ebb ebd ebe ebf ebi ebs ebt ed- eda edb edd ede edf edi eds edt eea eeb eed eee eef ees eet ef- efa efb efd efe eff efi efs eft eia eib eid eie eif eii eis eit es- esa esb esd ese esf esi ess est eta etb etd ete etf eti ets ett faa fab fad fae faf fai fas fat fba fbb fbd fbe fbf fbi fbs fbt fda fdb fdd fde fdf fdi fds fdt fea feb fed fee fef fei fes fet ffa ffd ffe fff ffi ffs fft fia fib fid fie fif fii fis fit fsa fsb fsd fse fsf fsi fss fst fta ftb ftd fte ftf fti fts ftt i-d i-f ia- iaa iab iad iae iaf iai ias iat iba ibb ibd ibe ibf ibi ibs ibt ida idb idd ide idf idi ids idt ie- iea ied iee ief iei ies iet ifa ifb ifd ife iff ifi ifs ift iia iib iid iie iif iii iis iit is- isa isb isd ise isf isi iss ist ita itb itd ite itf iti its itt saa sab sad sae saf sai sas sat sba sbb sbd sbe sbf sbi sbs sbt sda sdb sdd sde sdf sdi sds sdt se- sea seb sed see sef sei ses set sfa sfb sfd sfe sff sfi sfs sft sia sib sid sie sif sii sis sit ss- ssa ssb ssd sse ssf ssi sss sst sta stb std ste stf sti sts stt taa tab tad tae taf tai tas tat tba tbb tbd tbe tbf tbi tbs tbt tda tdb tdd tde tdf tdi tds tdt te- tea teb ted tee tef tei tes tet tfa tfb tfd tfe tff tfi tfs tft tia tib tid tie tif tii tis tit tsa tsb tsd tse tsf tsi tss tst tta ttb ttd tte ttf tti tts ttt