a-a a-b a-i a-t aaa aab aae aaf aag aai aan aas aat ab- aba abb abe abf abg abi abn abs abt aea aeb aee aef aeg aei aen aes aet af- afa afb afe aff afg afi afn afs aft ag- aga agb age agf agg agi agn ags agt ai- aia aib aie aif aig aii ain ais ait an- ana anb ane anf ang ani ann ans ant as- asa asb ase asf asg asi asn ass ast at- ata atb ate atf atg ati atn ats att baa bab bae baf bag bai ban bas bat bba bbb bbe bbf bbg bbi bbn bbs bbt be- bea beb bee bef beg bei ben bes bet bfa bfb bfe bff bfg bfi bfn bfs bft bga bgb bge bgf bgg bgi bgn bgs bgt bi- bia bib bie bif big bii bin bis bit bna bnb bne bnf bng bni bnn bns bnt bsa bsb bse bsf bsg bsi bsn bss bst bta btb bte btf btg bti btn bts btt eaa eab eae eaf eag eai ean eas eat eba ebb ebe ebf ebg ebi ebn ebs ebt eea eeb eee eef eeg een ees eet ef- efa efb efe eff efg efi efs eft ega egb ege egf egg egi egn egs egt eia eib eie eif eig eii ein eis eit en- ena enb ene enf eng eni enn ens ent es- esa esb ese esf esg esi esn ess est eta etb ete etf etg eti etn ets ett faa fab fae faf fag fai fan fas fat fba fbb fbe fbf fbg fbi fbn fbs fbt fea feb fee fef feg fei fen fes fet ffa ffe fff ffg ffi ffn ffs fft fga fgb fge fgf fgg fgi fgn fgs fgt fia fib fie fif fig fii fin fis fit fna fnb fne fnf fng fni fnn fns fnt fsa fsb fse fsf fsg fsi fsn fss fst fta ftb fte ftf ftg fti ftn fts ftt gaa gab gae gaf gag gai gan gas gat gba gbe gbf gbg gbi gbn gbs gbt ge- gea geb gee gef geg gei gen ges get gfa gfb gfe gff gfi gfs gft gga ggb ggg ggi ggn ggs ggt gia gib gie gif gig gii gin gis git gna gnb gne gnf gni gnn gns gnt gsa gsb gse gsf gsg gsi gsn gss gst gta gtb gte gtf gtg gti gtn gts gtt i-f ia- iaa iab iae iaf iag iai ian ias iat iba ibb ibe ibf ibg ibi ibn ibs ibt ie- iea iee ief ieg iei ien ies iet ifa ifb ife iff ifg ifi ifn ifs ift iga igb ige igf igg igi ign igs igt iia iib iie iif iii iin iis iit in- ina inb ine inf ing ini inn ins int is- isa isb ise isf isg isi isn iss ist ita itb ite itf itg iti itn its itt n-i naa nab nae naf nag nai nan nas nat nba nbb nbe nbf nbg nbi nbn nbs nbt ne- nea neb nee nef neg nei nen nes net nfa nfb nfe nff nfi nfn nfs nft nga ngb nge ngf ngg ngi ngn ngs ngt nia nib nie nif nig nii nin nis nit nna nnb nne nnf nng nni nnn nns nnt nsa nsb nse nsf nsg nsi nsn nss nst nta ntb nte ntf ntg nti ntn nts ntt saa sab sae saf sag sai san sas sat sba sbb sbe sbf sbg sbi sbn sbs sbt se- sea seb see sef seg sei sen ses set sfa sfb sfe sff sfg sfi sfn sfs sft sga sgb sge sgf sgg sgi sgn sgs sgt sia sib sie sif sig sii sin sis sit sna snb sne snf sng sni snn sns snt ss- ssa ssb sse ssf ssg ssi ssn sss sst sta stb ste stf stg sti stn sts stt taa tab tae taf tag tai tan tas tat tba tbb tbe tbf tbg tbi tbn tbs tbt te- tea teb tee tef teg tei ten tes tet tfa tfb tfe tff tfg tfi tfn tfs tft tga tgb tge tgf tgg tgi tgn tgs tgt tia tib tie tif tig tii tin tis tit tna tnb tne tnf tng tni tnn tns tnt tsa tsb tse tsf tsg tsi tsn tss tst tta ttb tte ttf ttg tti ttn tts ttt