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