speck pseck sepck espck pesck epsck spcek pscek scpek cspek pcsek cpsek secpk escpk scepk csepk ecspk cespk pecsk epcsk pcesk cpesk ecpsk cepsk spekc psekc sepkc espkc peskc epskc spkec pskec skpec kspec pksec kpsec sekpc eskpc skepc ksepc ekspc kespc peksc epksc pkesc kpesc ekpsc kepsc spcke pscke scpke cspke pcske cpske spkce pskce skpce kspce pksce kpsce sckpe cskpe skcpe kscpe ckspe kcspe pckse cpkse pkcse kpcse ckpse kcpse seckp esckp scekp csekp ecskp ceskp sekcp eskcp skecp ksecp ekscp kescp sckep cskep skcep kscep cksep kcsep ecksp ceksp ekcsp kecsp ckesp kcesp pecks epcks pceks cpeks ecpks cepks pekcs epkcs pkecs kpecs ekpcs kepcs pckes cpkes pkces kpces ckpes kcpes eckps cekps ekcps kecps ckeps kceps
Note: these 'words' (valid or invalid) are all the permutations of the word speck. These words are obtained by scrambling the letters in speck.