trild rtild tirld itrld ritld irtld trlid rtlid tlrid ltrid rltid lrtid tilrd itlrd tlird ltird iltrd litrd riltd irltd rlitd lritd ilrtd lirtd tridl rtidl tirdl itrdl ritdl irtdl trdil rtdil tdril dtril rdtil drtil tidrl itdrl tdirl dtirl idtrl ditrl ridtl irdtl rditl dritl idrtl dirtl trldi rtldi tlrdi ltrdi rltdi lrtdi trdli rtdli tdrli dtrli rdtli drtli tldri ltdri tdlri dtlri ldtri dltri rldti lrdti rdlti drlti ldrti dlrti tildr itldr tlidr ltidr iltdr litdr tidlr itdlr tdilr dtilr idtlr ditlr tldir ltdir tdlir dtlir ldtir dltir ildtr lidtr idltr diltr lditr dlitr rildt irldt rlidt lridt ilrdt lirdt ridlt irdlt rdilt drilt idrlt dirlt rldit lrdit rdlit drlit ldrit dlrit ildrt lidrt idlrt dilrt ldirt dlirt
Note: these 'words' (valid or invalid) are all the permutations of the word trild. These words are obtained by scrambling the letters in trild.