alefs laefs aelfs ealfs leafs elafs alfes lafes afles fales lfaes flaes aefls eafls afels faels efals feals lefas elfas lfeas fleas eflas felas alesf laesf aelsf ealsf leasf elasf alsef lasef aslef salef lsaef slaef aeslf easlf aself saelf esalf sealf lesaf elsaf lseaf sleaf eslaf selaf alfse lafse aflse false lfase flase alsfe lasfe aslfe salfe lsafe slafe afsle fasle asfle safle fsale sfale lfsae flsae lsfae slfae fslae sflae aefsl eafsl afesl faesl efasl feasl aesfl easfl asefl saefl esafl seafl afsel fasel asfel safel fsael sfael efsal fesal esfal sefal fseal sfeal lefsa elfsa lfesa flesa eflsa felsa lesfa elsfa lsefa slefa eslfa selfa lfsea flsea lsfea slfea fslea sflea efsla fesla esfla sefla fsela sfela
Note: these 'words' (valid or invalid) are all the permutations of the word alefs. These words are obtained by scrambling the letters in alefs.