sirup isrup sriup rsiup irsup risup siurp isurp suirp usirp iusrp uisrp sruip rsuip surip usrip rusip ursip irusp riusp iursp uirsp ruisp urisp sirpu isrpu sripu rsipu irspu rispu sipru ispru spiru psiru ipsru pisru srpiu rspiu spriu psriu rpsiu prsiu irpsu ripsu iprsu pirsu rpisu prisu siupr isupr suipr usipr iuspr uispr sipur ispur spiur psiur ipsur pisur supir uspir spuir psuir upsir pusir iupsr uipsr ipusr piusr upisr puisr srupi rsupi surpi usrpi ruspi urspi srpui rspui sprui psrui rpsui prsui supri uspri spuri psuri upsri pusri rupsi urpsi rpusi prusi uprsi pursi irups riups iurps uirps ruips urips irpus ripus iprus pirus rpius prius iuprs uiprs ipurs piurs upirs puirs rupis urpis rpuis pruis upris puris
Note: these 'words' (valid or invalid) are all the permutations of the word sirup. These words are obtained by scrambling the letters in sirup.