situp istup stiup tsiup itsup tisup siutp isutp suitp usitp iustp uistp stuip tsuip sutip ustip tusip utsip itusp tiusp iutsp uitsp tuisp utisp sitpu istpu stipu tsipu itspu tispu siptu isptu spitu psitu ipstu pistu stpiu tspiu sptiu pstiu tpsiu ptsiu itpsu tipsu iptsu pitsu tpisu ptisu siupt isupt suipt usipt iuspt uispt siput isput spiut psiut ipsut pisut supit uspit spuit psuit upsit pusit iupst uipst ipust piust upist puist stupi tsupi sutpi ustpi tuspi utspi stpui tspui sptui pstui tpsui ptsui supti uspti sputi psuti upsti pusti tupsi utpsi tpusi ptusi uptsi putsi itups tiups iutps uitps tuips utips itpus tipus iptus pitus tpius ptius iupts uipts iputs piuts upits puits tupis utpis tpuis ptuis uptis putis
Note: these 'words' (valid or invalid) are all the permutations of the word situp. These words are obtained by scrambling the letters in situp.