grebe rgebe gerbe egrbe regbe ergbe grbee rgbee gbree bgree rbgee brgee gebre egbre gbere bgere ebgre begre rebge erbge rbege brege ebrge berge greeb rgeeb gereb egreb regeb ergeb greeb rgeeb gereb egreb regeb ergeb geerb egerb geerb egerb eegrb eegrb reegb eregb reegb eregb eergb eergb grbee rgbee gbree bgree rbgee brgee grebe rgebe gerbe egrbe regbe ergbe gbere bgere gebre egbre begre ebgre rbege brege rebge erbge berge ebrge geber egber gbeer bgeer ebger beger geebr egebr geebr egebr eegbr eegbr gbeer bgeer geber egber beger ebger ebegr beegr eebgr eebgr beegr ebegr rebeg erbeg rbeeg breeg ebreg bereg reebg erebg reebg erebg eerbg eerbg rbeeg breeg rebeg erbeg bereg ebreg eberg beerg eebrg eebrg beerg eberg
Note: these 'words' (valid or invalid) are all the permutations of the word grebe. These words are obtained by scrambling the letters in grebe.