prowl rpowl porwl oprwl ropwl orpwl prwol rpwol pwrol wprol rwpol wrpol powrl opwrl pworl wporl owprl woprl rowpl orwpl rwopl wropl owrpl worpl prolw rpolw porlw oprlw roplw orplw prlow rplow plrow lprow rlpow lrpow polrw oplrw plorw lporw olprw loprw rolpw orlpw rlopw lropw olrpw lorpw prwlo rpwlo pwrlo wprlo rwplo wrplo prlwo rplwo plrwo lprwo rlpwo lrpwo pwlro wplro plwro lpwro wlpro lwpro rwlpo wrlpo rlwpo lrwpo wlrpo lwrpo powlr opwlr pwolr wpolr owplr woplr polwr oplwr plowr lpowr olpwr lopwr pwlor wplor plwor lpwor wlpor lwpor owlpr wolpr olwpr lowpr wlopr lwopr rowlp orwlp rwolp wrolp owrlp worlp rolwp orlwp rlowp lrowp olrwp lorwp rwlop wrlop rlwop lrwop wlrop lwrop owlrp wolrp olwrp lowrp wlorp lworp
Note: these 'words' (valid or invalid) are all the permutations of the word prowl. These words are obtained by scrambling the letters in prowl.