froth rfoth forth ofrth rofth orfth frtoh rftoh ftroh tfroh rtfoh trfoh fotrh oftrh ftorh tforh otfrh tofrh rotfh ortfh rtofh trofh otrfh torfh froht rfoht forht ofrht rofht orfht frhot rfhot fhrot hfrot rhfot hrfot fohrt ofhrt fhort hfort ohfrt hofrt rohft orhft rhoft hroft ohrft horft frtho rftho ftrho tfrho rtfho trfho frhto rfhto fhrto hfrto rhfto hrfto fthro tfhro fhtro hftro thfro htfro rthfo trhfo rhtfo hrtfo thrfo htrfo fothr ofthr ftohr tfohr otfhr tofhr fohtr ofhtr fhotr hfotr ohftr hoftr fthor tfhor fhtor hftor thfor htfor othfr tohfr ohtfr hotfr thofr htofr rothf orthf rtohf trohf otrhf torhf rohtf orhtf rhotf hrotf ohrtf hortf rthof trhof rhtof hrtof throf htrof othrf tohrf ohtrf hotrf thorf htorf
Note: these 'words' (valid or invalid) are all the permutations of the word froth. These words are obtained by scrambling the letters in froth.