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