xebec exbec xbeec bxeec ebxec bexec xeebc exebc xeebc exebc eexbc eexbc xbeec bxeec xebec exbec bexec ebxec ebexc beexc eebxc eebxc beexc ebexc xebce exbce xbece bxece ebxce bexce xecbe excbe xcebe cxebe ecxbe cexbe xbcee bxcee xcbee cxbee bcxee cbxee ebcxe becxe ecbxe cebxe bcexe cbexe xeecb execb xeecb execb eexcb eexcb xeceb exceb xceeb cxeeb ecxeb cexeb xeceb exceb xceeb cxeeb ecxeb cexeb eecxb eecxb ecexb ceexb ecexb ceexb xbece bxece xebce exbce bexce ebxce xbcee bxcee xcbee cxbee bcxee cbxee xecbe excbe xcebe cxebe ecxbe cexbe becxe ebcxe bcexe cbexe ecbxe cebxe ebecx beecx eebcx eebcx beecx ebecx ebcex becex ecbex cebex bceex cbeex eecbx eecbx ecebx ceebx ecebx ceebx becex ebcex bceex cbeex ecbex cebex
Note: these 'words' (valid or invalid) are all the permutations of the word xebec. These words are obtained by scrambling the letters in xebec.