a-a a-b a-i a-t aaa aab aae aaf aag aai aak aas aat ab- aba abb abe abf abg abi abk abs abt aea aeb aee aef aeg aei aek aes aet af- afa afb afe aff afg afi afk afs aft ag- aga agb age agf agg agi agk ags agt ai- aia aib aie aif aig aii aik ais ait aka akb ake akg aki akk aks as- asa asb ase asf asg asi ask ass ast at- ata atb ate atf atg ati ats att baa bab bae baf bag bai bak bas bat bba bbb bbe bbf bbg bbi bbk bbs bbt be- bea beb bee bef beg bei bek bes bet bfa bfb bfe bff bfg bfi bfs bft bga bgb bge bgf bgg bgi bgk bgs bgt bi- bia bib bie bif big bii bik bis bit bka bkb bke bkf bkg bkk bks bkt bsa bsb bse bsf bsg bsi bsk bss bst bta btb bte btf btg bti btk bts btt eaa eab eae eaf eag eai eak eas eat eba ebb ebe ebf ebg ebi ebk ebs ebt eea eeb eee eef eeg eek ees eet ef- efa efb efe eff efg efi efs eft ega egb ege egf egg egi egs egt eia eib eie eif eig eii eik eis eit eka ekb eke ekf ekg eki eks ekt es- esa esb ese esf esg esi esk ess est eta etb ete etf etg eti etk ets ett faa fab fae faf fag fai fak fas fat fba fbb fbe fbf fbg fbi fbk fbs fbt fea feb fee fef feg fei fek fes fet ffa ffe fff ffg ffi ffk ffs fft fga fgb fge fgf fgg fgi fgs fgt fia fib fie fif fig fii fik fis fit fka fkb fkf fkg fki fkk fkt fsa fsb fse fsf fsg fsi fsk fss fst fta ftb fte ftf ftg fti ftk fts ftt gaa gab gae gaf gag gai gak gas gat gba gbe gbf gbg gbi gbk gbs gbt ge- gea geb gee gef geg gei gek ges get gfa gfb gfe gff gfi gfk gfs gft gga ggb ggg ggi ggs ggt gia gib gie gif gig gii gik gis git gka gkb gks gkt gsa gsb gse gsf gsg gsi gsk gss gst gta gtb gte gtf gtg gti gtk gts gtt i-f ia- iaa iab iae iaf iag iai ias iat iba ibb ibe ibf ibg ibi ibk ibs ibt ie- iea iee ief ieg iei iek ies iet ifa ifb ife iff ifg ifi ifs ift iga igb ige igf igg igi igk igs igt iia iib iie iif iii iis iit ika ikb ike ikf iki ikk iks ikt is- isa isb ise isf isg isi isk iss ist ita itb ite itf itg iti itk its itt k-t ka- kaa kab kae kaf kag kai kak kas kat kba kbb kbe kbf kbi kbk kbs ke- kea keb kee kef keg kei kek kes ket kfa kff kfg kfi kfs kga kgb kgf kgi kgs kia kib kie kif kig kii kik kis kit kkb kke kki kkk kks kkt ksa ksb kse ksf ksg ksi ksk kss kst kta ktb kte ktf ktg ktk kts ktt saa sab sae saf sag sai sak sas sat sba sbb sbe sbf sbg sbi sbk sbs sbt se- sea seb see sef seg sei sek ses set sfa sfb sfe sff sfg sfi sfk sfs sft sga sgb sge sgf sgg sgi sgk sgs sgt sia sib sie sif sig sii sik sis sit sk- ska skb ske skf skg ski skk sks skt ss- ssa ssb sse ssf ssg ssi ssk sss sst sta stb ste stf stg sti stk sts stt taa tab tae taf tag tai tak tas tat tba tbb tbe tbf tbg tbi tbk tbs tbt te- tea teb tee tef teg tei tek tes tet tfa tfb tfe tff tfg tfi tfk tfs tft tga tgb tge tgf tgg tgi tgk tgs tgt tia tib tie tif tig tii tik tis tit tka tkb tke tkg tkk tks tkt tsa tsb tse tsf tsg tsi tsk tss tst tta ttb tte ttf ttg tti ttk tts ttt