-ic a-a a-b a-c a-i a-t aaa aab aac aai aak aan aat ab- aba abb abc abi abk abn abt ac- aca acb acc aci ack acn act ai- aia aib aic aii aik ain ait aka akb akc aki akk akn an- ana anb anc ani ank ann ant at- ata atb atc ati atn att baa bab bac bai bak ban bat bba bbb bbc bbi bbk bbn bbt bca bcb bcc bci bck bcn bct bi- bia bib bic bii bik bin bit bka bkb bkc bkk bkn bkt bna bnb bnc bni bnk bnn bnt bta btb btc bti btk btn btt c-- caa cab cac cai cak can cat cba cbb cbc cbi cbk cbn cbt cca ccb ccc cci cck ccn cct ci- cia cib cic cii cik cin cit cka ckb ckc cki ckt cn- cna cnb cnc cni cnn cnt cta ctb ctc cti ctk ctn ctt ia- iaa iab iac iai ian iat iba ibb ibc ibi ibk ibn ibt ica icb icc ici ick icn ict iia iib iic iii iin iit ika ikb ikc iki ikk ikt in- ina inb inc ini ink inn int ita itb itc iti itk itn itt k-t ka- kaa kab kac kai kak kan kat kba kbb kbc kbi kbk kbn kca kcb kcc kci kck kcn kct kia kib kic kii kik kin kit kkb kkc kki kkk kkn kkt kn- kna knc kni knk knn knt kta ktb ktc ktk ktn ktt n-i naa nab nac nai nak nan nat nba nbb nbc nbi nbk nbn nbt nca ncb ncc nci nck ncn nct nia nib nic nii nik nin nit nka nkc nki nkk nkn nkt nna nnb nnc nni nnk nnn nnt nta ntb ntc nti ntk ntn ntt taa tab tac tai tak tan tat tba tbb tbc tbi tbk tbn tbt tca tcb tcc tci tck tcn tct tia tib tic tii tik tin tit tka tkb tkc tkk tkt tna tnb tnc tni tnk tnn tnt tta ttb ttc tti ttk ttn ttt