rheas hreas rehas erhas heras ehras rhaes hraes rahes arhes hares ahres reahs erahs raehs arehs earhs aerhs hears ehars haers ahers eahrs aehrs rhesa hresa rehsa erhsa hersa ehrsa rhsea hrsea rshea srhea hsrea shrea resha ersha rseha sreha esrha serha hesra ehsra hsera shera eshra sehra rhase hrase rahse arhse harse ahrse rhsae hrsae rshae srhae hsrae shrae rashe arshe rsahe srahe asrhe sarhe hasre ahsre hsare share ashre sahre reash erash raesh aresh earsh aersh resah ersah rseah sreah esrah serah raseh arseh rsaeh sraeh asreh sareh easrh aesrh esarh searh aserh saerh heasr ehasr haesr ahesr eahsr aehsr hesar ehsar hsear shear eshar sehar haser ahser hsaer shaer asher saher eashr aeshr esahr seahr asehr saehr
Note: these 'words' (valid or invalid) are all the permutations of the word rheas. These words are obtained by scrambling the letters in rheas.