itslp tislp istlp sitlp tsilp stilp itlsp tilsp iltsp litsp tlisp ltisp isltp siltp ilstp listp slitp lsitp tslip stlip tlsip ltsip sltip lstip itspl tispl istpl sitpl tsipl stipl itpsl tipsl iptsl pitsl tpisl ptisl isptl siptl ipstl pistl spitl psitl tspil stpil tpsil ptsil sptil pstil itlps tilps iltps litps tlips ltips itpls tipls iptls pitls tpils ptils ilpts lipts iplts pilts lpits plits tlpis ltpis tplis ptlis lptis pltis islpt silpt ilspt lispt slipt lsipt isplt siplt ipslt pislt spilt psilt ilpst lipst iplst pilst lpist plist slpit lspit split pslit lpsit plsit tslpi stlpi tlspi ltspi sltpi lstpi tspli stpli tpsli ptsli sptli pstli tlpsi ltpsi tplsi ptlsi lptsi pltsi slpti lspti splti pslti lpsti plsti
Note: these 'words' (valid or invalid) are all the permutations of the word itslp. These words are obtained by scrambling the letters in itslp.