ocisf coisf oicsf iocsf ciosf icosf ocsif cosif oscif socif csoif scoif oiscf ioscf osicf soicf isocf siocf cisof icsof csiof sciof iscof sicof ocifs coifs oicfs iocfs ciofs icofs ocfis cofis ofcis focis cfois fcois oifcs iofcs ofics foics ifocs fiocs cifos icfos cfios fcios ifcos ficos ocsfi cosfi oscfi socfi csofi scofi ocfsi cofsi ofcsi focsi cfosi fcosi osfci sofci ofsci fosci sfoci fsoci csfoi scfoi cfsoi fcsoi sfcoi fscoi oisfc iosfc osifc soifc isofc siofc oifsc iofsc ofisc foisc ifosc fiosc osfic sofic ofsic fosic sfoic fsoic isfoc sifoc ifsoc fisoc sfioc fsioc cisfo icsfo csifo scifo iscfo sicfo cifso icfso cfiso fciso ifcso ficso csfio scfio cfsio fcsio sfcio fscio isfco sifco ifsco fisco sfico fsico
Note: these 'words' (valid or invalid) are all the permutations of the word ocisf. These words are obtained by scrambling the letters in ocisf.