-ic a-a a-b a-c a-i a-t aaa aab aac aai aan aat ab- aba abb abc abi abn abt ac- aca acb acc aci acn act ai- aia aib aic aii ain ait an- ana anb anc ani ann ant at- ata atb atc ati atn att baa bab bac bai ban bat bba bbb bbc bbi bbn bbt bca bcb bcc bci bcn bct bi- bia bib bic bii bin bit bna bnb bnc bni bnn bnt bta btb btc bti btn btt c-- caa cab cac cai can cat cba cbb cbc cbi cbn cbt cca ccb ccc cci ccn cct ci- cia cib cic cii cin cit cn- cna cnb cnc cni cnn cnt cta ctb ctc cti ctn ctt ia- iaa iab iac iai ian iat iba ibb ibc ibi ibn ibt ica icb icc ici icn ict iia iib iic iii iin iit in- ina inb inc ini inn int ita itb itc iti itn itt n-i naa nab nac nai nan nat nba nbb nbc nbi nbn nbt nca ncb ncc nci ncn nct nia nib nic nii nin nit nna nnb nnc nni nnn nnt nta ntb ntc nti ntn ntt taa tab tac tai tan tat tba tbb tbc tbi tbn tbt tca tcb tcc tci tcn tct tia tib tic tii tin tit tna tnb tnc tni tnn tnt tta ttb ttc tti ttn ttt