-ic a-a a-b a-c a-i a-t aaa aab aac aag aai aak aan aat ab- aba abb abc abg abi abk abn abt ac- aca acb acc acg aci ack acn act ag- aga agb agc agg agi agk agn agt ai- aia aib aic aig aii aik ain ait aka akb akc akg aki akk akn an- ana anb anc ang ani ank ann ant at- ata atb atc atg ati atn att baa bab bac bag bai bak ban bat bba bbb bbc bbg bbi bbk bbn bbt bca bcb bcc bcg bci bck bcn bct bga bgb bgc bgg bgi bgk bgn bgt bi- bia bib bic big bii bik bin bit bka bkb bkc bkg bkk bkn bkt bna bnb bnc bng bni bnk bnn bnt bta btb btc btg bti btk btn btt c-- caa cab cac cag cai cak can cat cba cbb cbc cbg cbi cbk cbn cbt cca ccb ccc ccg cci cck ccn cct cga cgb cgc cgg cgi cgn cgt ci- cia cib cic cig cii cik cin cit cka ckb ckc cki ckt cn- cna cnb cnc cng cni cnn cnt cta ctb ctc ctg cti ctk ctn ctt gaa gab gac gag gai gak gan gat gba gbc gbg gbi gbk gbn gbt gca gcb gcc gcg gci gck gcn gct gga ggb ggc ggg ggi ggn ggt gia gib gic gig gii gik gin git gka gkb gkn gkt gna gnb gnc gni gnn gnt gta gtb gtc gtg gti gtk gtn gtt ia- iaa iab iac iag iai ian iat iba ibb ibc ibg ibi ibk ibn ibt ica icb icc icg ici ick icn ict iga igb igc igg igi igk ign igt iia iib iic iii iin iit ika ikb ikc iki ikk ikt in- ina inb inc ing ini ink inn int ita itb itc itg iti itk itn itt k-t ka- kaa kab kac kag kai kak kan kat kba kbb kbc kbi kbk kbn kca kcb kcc kcg kci kck kcn kct kga kgb kgc kgi kia kib kic kig kii kik kin kit kkb kkc kki kkk kkn kkt kn- kna knc kng kni knk knn knt kta ktb ktc ktg ktk ktn ktt n-i naa nab nac nag nai nak nan nat nba nbb nbc nbg nbi nbk nbn nbt nca ncb ncc ncg nci nck ncn nct nga ngb ngc ngg ngi ngk ngn ngt nia nib nic nig nii nik nin nit nka nkc nki nkk nkn nkt nna nnb nnc nng nni nnk nnn nnt nta ntb ntc ntg nti ntk ntn ntt taa tab tac tag tai tak tan tat tba tbb tbc tbg tbi tbk tbn tbt tca tcb tcc tcg tci tck tcn tct tga tgb tgc tgg tgi tgk tgn tgt tia tib tic tig tii tik tin tit tka tkb tkc tkg tkk tkt tna tnb tnc tng tni tnk tnn tnt tta ttb ttc ttg tti ttk ttn ttt