-ic a-a a-b a-c a-i a-t aaa aab aac aae aai aan aat aax ab- aba abb abc abe abi abn abt abx ac- aca acb acc ace aci acn act acx aea aeb aec aee aei aen aet aex ai- aia aib aic aie aii ain ait aix an- ana anb anc ane ani ann ant anx at- ata atb atc ate ati atn att atx ax- axa axe axi axn axt axx baa bab bac bae bai ban bat bax bba bbb bbc bbe bbi bbn bbt bbx bca bcb bcc bce bci bcn bct bcx be- bea beb bec bee bei ben bet bex bi- bia bib bic bie bii bin bit bix bna bnb bnc bne bni bnn bnt bnx bta btb btc bte bti btn btt btx bxb bxi bxn bxx c-- caa cab cac cae cai can cat cax cba cbb cbc cbe cbi cbn cbt cbx cca ccb ccc cce cci ccn cct ccx ce- cea ceb cec cee cei cen cet cex ci- cia cib cic cie cii cin cit cix cn- cna cnb cnc cne cni cnn cnt cnx cta ctb ctc cte cti ctn ctt ctx cxc cxi cxt cxx eaa eab eac eae eai ean eat eax eba ebb ebc ebe ebi ebn ebt ebx ec- eca ecb ecc ece eci ecn ect ecx eea eeb eec eee een eet eex eia eib eic eie eii ein eit eix en- ena enb enc ene eni enn ent eta etb etc ete eti etn ett etx ex- exa exc exe exi ext exx ia- iaa iab iac iae iai ian iat iba ibb ibc ibe ibi ibn ibt ibx ica icb icc ice ici icn ict ie- iea iec iee iei ien iet iex iia iib iic iie iii iin iit iix in- ina inb inc ine ini inn int inx ita itb itc ite iti itn itt itx ixc ixe ixi ixn n-i naa nab nac nae nai nan nat nax nba nbb nbc nbe nbi nbn nbt nbx nca ncb ncc nce nci ncn nct ncx ne- nea neb nec nee nei nen net nex nia nib nic nie nii nin nit nix nna nnb nnc nne nni nnn nnt nta ntb ntc nte nti ntn ntt ntx nxc nxt t-x taa tab tac tae tai tan tat tax tba tbb tbc tbe tbi tbn tbt tca tcb tcc tce tci tcn tct tcx te- tea teb tec tee tei ten tet tex tia tib tic tie tii tin tit tix tna tnb tnc tne tni tnn tnt tnx tta ttb ttc tte tti ttn ttt ttx txe txi txn txt xaa xac xan xat xbc xbe xbx xcb xci xcx xee xen xet xex xia xic xie xii xin xit xix xna xnc xtc xti xtx xxi xxx