train rtain tarin atrin ratin artin trian rtian tiran itran ritan irtan tairn atirn tiarn itarn aitrn iatrn raitn aritn riatn iratn airtn iartn trani rtani tarni atrni ratni artni trnai rtnai tnrai ntrai rntai nrtai tanri atnri tnari ntari antri natri ranti arnti rnati nrati anrti narti trina rtina tirna itrna ritna irtna trnia rtnia tnria ntria rntia nrtia tinra itnra tnira ntira intra nitra rinta irnta rnita nrita inrta nirta tainr atinr tianr itanr aitnr iatnr tanir atnir tnair ntair antir natir tinar itnar tniar ntiar intar nitar aintr iantr anitr naitr inatr niatr raint arint riant irant airnt iarnt ranit arnit rnait nrait anrit narit rinat irnat rniat nriat inrat nirat ainrt ianrt anirt nairt inart niart
Note: these 'words' (valid or invalid) are all the permutations of the word train. These words are obtained by scrambling the letters in train.