pulks uplks pluks lpuks ulpks lupks pukls upkls pkuls kpuls ukpls kupls plkus lpkus pklus kplus lkpus klpus ulkps lukps uklps kulps lkups klups pulsk uplsk plusk lpusk ulpsk lupsk puslk upslk psulk spulk usplk suplk plsuk lpsuk psluk spluk lspuk slpuk ulspk luspk uslpk sulpk lsupk slupk puksl upksl pkusl kpusl ukpsl kupsl puskl upskl psukl spukl uspkl supkl pksul kpsul pskul spkul kspul skpul ukspl kuspl uskpl sukpl ksupl skupl plksu lpksu pklsu kplsu lkpsu klpsu plsku lpsku pslku splku lspku slpku pkslu kpslu psklu spklu ksplu skplu lkspu klspu lskpu slkpu kslpu sklpu ulksp luksp uklsp kulsp lkusp klusp ulskp luskp uslkp sulkp lsukp slukp ukslp kuslp usklp suklp ksulp skulp lksup klsup lskup slkup kslup sklup
Note: these 'words' (valid or invalid) are all the permutations of the word pulks. These words are obtained by scrambling the letters in pulks.