ridge irdge rdige drige idrge dirge rigde irgde rgide gride igrde girde rdgie drgie rgdie grdie dgrie gdrie idgre digre igdre gidre dgire gdire rideg irdeg rdieg drieg idreg direg riedg iredg reidg eridg ierdg eirdg rdeig dreig redig erdig derig edrig iderg dierg iedrg eidrg deirg edirg riged irged rgied gried igred gired riegd iregd reigd erigd iergd eirgd rgeid greid regid ergid gerid egrid igerd gierd iegrd eigrd geird egird rdgei drgei rgdei grdei dgrei gdrei rdegi dregi redgi erdgi dergi edrgi rgedi gredi regdi ergdi gerdi egrdi dgeri gderi degri edgri gedri egdri idger diger igder gider dgier gdier idegr diegr iedgr eidgr deigr edigr igedr giedr iegdr eigdr geidr egidr dgeir gdeir degir edgir gedir egdir
Note: these 'words' (valid or invalid) are all the permutations of the word ridge. These words are obtained by scrambling the letters in ridge.