tract rtact tarct atrct ratct artct trcat rtcat tcrat ctrat rctat crtat tacrt atcrt tcart ctart actrt catrt ractt arctt rcatt cratt acrtt cartt tratc rtatc tartc atrtc rattc arttc trtac rttac ttrac ttrac rttac trtac tatrc attrc ttarc ttarc attrc tatrc rattc arttc rtatc tratc atrtc tartc trcta rtcta tcrta ctrta rctta crtta trtca rttca ttrca ttrca rttca trtca tctra cttra ttcra ttcra cttra tctra rctta crtta rtcta trcta ctrta tcrta tactr atctr tcatr ctatr acttr cattr tatcr attcr ttacr ttacr attcr tatcr tctar cttar ttcar ttcar cttar tctar acttr cattr atctr tactr ctatr tcatr ractt arctt rcatt cratt acrtt cartt ratct artct rtact tract atrct tarct rctat crtat rtcat trcat ctrat tcrat actrt catrt atcrt tacrt ctart tcart
Note: these 'words' (valid or invalid) are all the permutations of the word tract. These words are obtained by scrambling the letters in tract.