frogo rfogo forgo ofrgo rofgo orfgo frgoo rfgoo fgroo gfroo rgfoo grfoo fogro ofgro fgoro gforo ogfro gofro rogfo orgfo rgofo grofo ogrfo gorfo froog rfoog forog ofrog rofog orfog froog rfoog forog ofrog rofog orfog foorg oforg foorg oforg oofrg oofrg roofg orofg roofg orofg oorfg oorfg frgoo rfgoo fgroo gfroo rgfoo grfoo frogo rfogo forgo ofrgo rofgo orfgo fgoro gforo fogro ofgro gofro ogfro rgofo grofo rogfo orgfo gorfo ogrfo fogor ofgor fgoor gfoor ogfor gofor foogr ofogr foogr ofogr oofgr oofgr fgoor gfoor fogor ofgor gofor ogfor ogofr goofr oogfr oogfr goofr ogofr rogof orgof rgoof groof ogrof gorof roogf orogf roogf orogf oorgf oorgf rgoof groof rogof orgof gorof ogrof ogorf goorf oogrf oogrf goorf ogorf
Note: these 'words' (valid or invalid) are all the permutations of the word frogo. These words are obtained by scrambling the letters in frogo.