roctr orctr rcotr crotr ocrtr cortr rotcr ortcr rtocr trocr otrcr torcr rctor crtor rtcor trcor ctror tcror octrr cotrr otcrr tocrr ctorr tcorr rocrt orcrt rcort crort ocrrt corrt rorct orrct rroct rroct orrct rorct rcrot crrot rrcot rrcot crrot rcrot ocrrt corrt orcrt rocrt crort rcort rotrc ortrc rtorc trorc otrrc torrc rortc orrtc rrotc rrotc orrtc rortc rtroc trroc rrtoc rrtoc trroc rtroc otrrc torrc ortrc rotrc trorc rtorc rctro crtro rtcro trcro ctrro tcrro rcrto crrto rrcto rrcto crrto rcrto rtrco trrco rrtco rrtco trrco rtrco ctrro tcrro crtro rctro trcro rtcro octrr cotrr otcrr tocrr ctorr tcorr ocrtr cortr orctr roctr crotr rcotr otrcr torcr ortcr rotcr trocr rtocr ctror tcror crtor rctor trcor rtcor
Note: these 'words' (valid or invalid) are all the permutations of the word roctr. These words are obtained by scrambling the letters in roctr.