-ic a-a a-b a-c a-i a-t aaa aab aac aae aai aak aan aat ab- aba abb abc abe abi abk abn abt ac- aca acb acc ace aci ack acn act aea aeb aec aee aei aek aen aet ai- aia aib aic aie aii aik ain ait aka akb akc ake aki akk akn an- ana anb anc ane ani ank ann ant at- ata atb atc ate ati atn att baa bab bac bae bai bak ban bat bba bbb bbc bbe bbi bbk bbn bbt bca bcb bcc bce bci bck bcn bct be- bea beb bec bee bei bek ben bet bi- bia bib bic bie bii bik bin bit bka bkb bkc bke bkk bkn bkt bna bnb bnc bne bni bnk bnn bnt bta btb btc bte bti btk btn btt c-- caa cab cac cae cai cak can cat cba cbb cbc cbe cbi cbk cbn cbt cca ccb ccc cce cci cck ccn cct ce- cea ceb cec cee cei cek cen cet ci- cia cib cic cie cii cik cin cit cka ckb ckc cki ckt cn- cna cnb cnc cne cni cnn cnt cta ctb ctc cte cti ctk ctn ctt eaa eab eac eae eai eak ean eat eba ebb ebc ebe ebi ebk ebn ebt ec- eca ecb ecc ece eci eck ecn ect eea eeb eec eee eek een eet eia eib eic eie eii eik ein eit eka ekb ekc eke eki ekt en- ena enb enc ene eni enk enn ent eta etb etc ete eti etk etn ett ia- iaa iab iac iae iai ian iat iba ibb ibc ibe ibi ibk ibn ibt ica icb icc ice ici ick icn ict ie- iea iec iee iei iek ien iet iia iib iic iie iii iin iit ika ikb ikc ike iki ikk ikt in- ina inb inc ine ini ink inn int ita itb itc ite iti itk itn itt k-t ka- kaa kab kac kae kai kak kan kat kba kbb kbc kbe kbi kbk kbn kca kcb kcc kce kci kck kcn kct ke- kea keb kec kee kei kek ken ket kia kib kic kie kii kik kin kit kkb kkc kke kki kkk kkn kkt kn- kna knc kne kni knk knn knt kta ktb ktc kte ktk ktn ktt n-i naa nab nac nae nai nak nan nat nba nbb nbc nbe nbi nbk nbn nbt nca ncb ncc nce nci nck ncn nct ne- nea neb nec nee nei nek nen net nia nib nic nie nii nik nin nit nka nkc nke nki nkk nkn nkt nna nnb nnc nne nni nnk nnn nnt nta ntb ntc nte nti ntk ntn ntt taa tab tac tae tai tak tan tat tba tbb tbc tbe tbi tbk tbn tbt tca tcb tcc tce tci tck tcn tct te- tea teb tec tee tei tek ten tet tia tib tic tie tii tik tin tit tka tkb tkc tke tkk tkt tna tnb tnc tne tni tnk tnn tnt tta ttb ttc tte tti ttk ttn ttt