tarts atrts trats rtats artts ratts tatrs attrs ttars ttars attrs tatrs trtas rttas ttras ttras rttas trtas artts ratts atrts tarts rtats trats tarst atrst trast rtast artst ratst tasrt atsrt tsart start astrt satrt trsat rtsat tsrat strat rstat srtat arstt rastt asrtt sartt rsatt sratt tatsr attsr ttasr ttasr attsr tatsr tastr atstr tsatr statr asttr sattr ttsar ttsar tstar sttar tstar sttar atstr tastr asttr sattr tsatr statr trtsa rttsa ttrsa ttrsa rttsa trtsa trsta rtsta tsrta strta rstta srtta ttsra ttsra tstra sttra tstra sttra rtsta trsta rstta srtta tsrta strta artst ratst atrst tarst rtast trast arstt rastt asrtt sartt rsatt sratt atsrt tasrt astrt satrt tsart start rtsat trsat rstat srtat tsrat strat
Note: these 'words' (valid or invalid) are all the permutations of the word tarts. These words are obtained by scrambling the letters in tarts.