a-a a-b a-i a-t aaa aab aag aai aak aas aat ab- aba abb abg abi abk abs abt ag- aga agb agg agi agk ags agt ai- aia aib aig aii aik ais ait aka akb akg aki akk aks as- asa asb asg asi ask ass ast at- ata atb atg ati ats att baa bab bag bai bak bas bat bba bbb bbg bbi bbk bbs bbt bga bgb bgg bgi bgk bgs bgt bi- bia bib big bii bik bis bit bka bkb bkg bkk bks bkt bsa bsb bsg bsi bsk bss bst bta btb btg bti btk bts btt gaa gab gag gai gak gas gat gba gbg gbi gbk gbs gbt gga ggb ggg ggi ggs ggt gia gib gig gii gik gis git gka gkb gks gkt gsa gsb gsg gsi gsk gss gst gta gtb gtg gti gtk gts gtt ia- iaa iab iag iai ias iat iba ibb ibg ibi ibk ibs ibt iga igb igg igi igk igs igt iia iib iii iis iit ika ikb iki ikk iks ikt is- isa isb isg isi isk iss ist ita itb itg iti itk its itt k-t ka- kaa kab kag kai kak kas kat kba kbb kbi kbk kbs kga kgb kgi kgs kia kib kig kii kik kis kit kkb kki kkk kks kkt ksa ksb ksg ksi ksk kss kst kta ktb ktg ktk kts ktt saa sab sag sai sak sas sat sba sbb sbg sbi sbk sbs sbt sga sgb sgg sgi sgk sgs sgt sia sib sig sii sik sis sit sk- ska skb skg ski skk sks skt ss- ssa ssb ssg ssi ssk sss sst sta stb stg sti stk sts stt taa tab tag tai tak tas tat tba tbb tbg tbi tbk tbs tbt tga tgb tgg tgi tgk tgs tgt tia tib tig tii tik tis tit tka tkb tkg tkk tks tkt tsa tsb tsg tsi tsk tss tst tta ttb ttg tti ttk tts ttt