unspl nuspl usnpl sunpl nsupl snupl unpsl nupsl upnsl punsl npusl pnusl uspnl supnl upsnl pusnl spunl psunl nspul snpul npsul pnsul spnul psnul unslp nuslp usnlp sunlp nsulp snulp unlsp nulsp ulnsp lunsp nlusp lnusp uslnp sulnp ulsnp lusnp slunp lsunp nslup snlup nlsup lnsup slnup lsnup unpls nupls upnls punls npuls pnuls unlps nulps ulnps lunps nlups lnups uplns pulns ulpns lupns pluns lpuns nplus pnlus nlpus lnpus plnus lpnus uspln supln upsln pusln spuln psuln uslpn sulpn ulspn luspn slupn lsupn uplsn pulsn ulpsn lupsn plusn lpusn splun pslun slpun lspun plsun lpsun nsplu snplu npslu pnslu spnlu psnlu nslpu snlpu nlspu lnspu slnpu lsnpu nplsu pnlsu nlpsu lnpsu plnsu lpnsu splnu pslnu slpnu lspnu plsnu lpsnu
Note: these 'words' (valid or invalid) are all the permutations of the word unspl. These words are obtained by scrambling the letters in unspl.