-ic a-a a-b a-c a-i aaa aab aac aai aan aax ab- aba abb abc abi abn abx ac- aca acb acc aci acn acx ai- aia aib aic aii ain aix an- ana anb anc ani ann anx ax- axa axi axn axx baa bab bac bai ban bax bba bbb bbc bbi bbn bbx bca bcb bcc bci bcn bcx bi- bia bib bic bii bin bix bna bnb bnc bni bnn bnx bxb bxi bxn bxx c-- caa cab cac cai can cax cba cbb cbc cbi cbn cbx cca ccb ccc cci ccn ccx ci- cia cib cic cii cin cix cn- cna cnb cnc cni cnn cnx cxc cxi cxx ia- iaa iab iac iai ian iba ibb ibc ibi ibn ibx ica icb icc ici icn iia iib iic iii iin iix in- ina inb inc ini inn inx ixc ixi ixn n-i naa nab nac nai nan nax nba nbb nbc nbi nbn nbx nca ncb ncc nci ncn ncx nia nib nic nii nin nix nna nnb nnc nni nnn nxc xaa xac xan xbc xbx xcb xci xcx xia xic xii xin xix xna xnc xxi xxx