solid oslid sloid lsoid olsid losid soild osild siold isold oisld iosld sliod lsiod silod islod lisod ilsod olisd loisd oilsd iolsd liosd ilosd soldi osldi slodi lsodi olsdi losdi sodli osdli sdoli dsoli odsli dosli sldoi lsdoi sdloi dsloi ldsoi dlsoi oldsi lodsi odlsi dolsi ldosi dlosi soidl osidl siodl isodl oisdl iosdl sodil osdil sdoil dsoil odsil dosil sidol isdol sdiol dsiol idsol disol oidsl iodsl odisl doisl idosl diosl slido lsido sildo isldo lisdo ilsdo sldio lsdio sdlio dslio ldsio dlsio sidlo isdlo sdilo dsilo idslo dislo lidso ildso ldiso dliso idlso dilso olids loids oilds iolds liods ilods oldis lodis odlis dolis ldois dlois oidls iodls odils doils idols diols lidos ildos ldios dlios idlos dilos
Note: these 'words' (valid or invalid) are all the permutations of the word solid. These words are obtained by scrambling the letters in solid.