skeef kseef sekef eskef kesef eksef skeef kseef sekef eskef kesef eksef seekf esekf seekf esekf eeskf eeskf keesf ekesf keesf ekesf eeksf eeksf skefe ksefe sekfe eskfe kesfe eksfe skfee ksfee sfkee fskee kfsee fksee sefke esfke sfeke fseke efske feske kefse ekfse kfese fkese efkse fekse skefe ksefe sekfe eskfe kesfe eksfe skfee ksfee sfkee fskee kfsee fksee sefke esfke sfeke fseke efske feske kefse ekfse kfese fkese efkse fekse seefk esefk seefk esefk eesfk eesfk sefek esfek sfeek fseek efsek fesek sefek esfek sfeek fseek efsek fesek eefsk eefsk efesk feesk efesk feesk keefs ekefs keefs ekefs eekfs eekfs kefes ekfes kfees fkees efkes fekes kefes ekfes kfees fkees efkes fekes eefks eefks efeks feeks efeks feeks
Note: these 'words' (valid or invalid) are all the permutations of the word skeef. These words are obtained by scrambling the letters in skeef.