indol nidol idnol dinol ndiol dniol inodl niodl iondl oindl noidl onidl idonl dionl iodnl oidnl doinl odinl ndoil dnoil nodil ondil donil odnil indlo nidlo idnlo dinlo ndilo dnilo inldo nildo ilndo lindo nlido lnido idlno dilno ildno lidno dlino ldino ndlio dnlio nldio lndio dlnio ldnio inold niold ionld oinld noild onild inlod nilod ilnod linod nliod lniod iolnd oilnd ilond liond olind loind nolid onlid nloid lnoid olnid lonid idoln dioln iodln oidln doiln odiln idlon dilon ildon lidon dlion ldion ioldn oildn ilodn liodn olidn loidn dolin odlin dloin ldoin oldin lodin ndoli dnoli nodli ondli donli odnli ndloi dnloi nldoi lndoi dlnoi ldnoi noldi onldi nlodi lnodi olndi londi dolni odlni dloni ldoni oldni lodni
Note: these 'words' (valid or invalid) are all the permutations of the word indol. These words are obtained by scrambling the letters in indol.