foals ofals faols afols oafls aofls folas oflas floas lfoas olfas lofas falos aflos flaos lfaos alfos lafos oalfs aolfs olafs loafs alofs laofs foasl ofasl faosl afosl oafsl aofsl fosal ofsal fsoal sfoal osfal sofal fasol afsol fsaol sfaol asfol safol oasfl aosfl osafl soafl asofl saofl folsa oflsa flosa lfosa olfsa lofsa fosla ofsla fsola sfola osfla sofla flsoa lfsoa fsloa sfloa lsfoa slfoa olsfa losfa oslfa solfa lsofa slofa falso aflso flaso lfaso alfso lafso faslo afslo fsalo sfalo asflo saflo flsao lfsao fslao sflao lsfao slfao alsfo lasfo aslfo salfo lsafo slafo oalsf aolsf olasf loasf alosf laosf oaslf aoslf osalf soalf asolf saolf olsaf losaf oslaf solaf lsoaf sloaf alsof lasof aslof salof lsaof slaof
Note: these 'words' (valid or invalid) are all the permutations of the word foals. These words are obtained by scrambling the letters in foals.