ofish foish oifsh iofsh fiosh ifosh ofsih fosih osfih sofih fsoih sfoih oisfh iosfh osifh soifh isofh siofh fisoh ifsoh fsioh sfioh isfoh sifoh ofihs foihs oifhs iofhs fiohs ifohs ofhis fohis ohfis hofis fhois hfois oihfs iohfs ohifs hoifs ihofs hiofs fihos ifhos fhios hfios ihfos hifos ofshi foshi osfhi sofhi fsohi sfohi ofhsi fohsi ohfsi hofsi fhosi hfosi oshfi sohfi ohsfi hosfi shofi hsofi fshoi sfhoi fhsoi hfsoi shfoi hsfoi oishf ioshf osihf soihf isohf siohf oihsf iohsf ohisf hoisf ihosf hiosf oshif sohif ohsif hosif shoif hsoif ishof sihof ihsof hisof shiof hsiof fisho ifsho fsiho sfiho isfho sifho fihso ifhso fhiso hfiso ihfso hifso fshio sfhio fhsio hfsio shfio hsfio ishfo sihfo ihsfo hisfo shifo hsifo
Note: these 'words' (valid or invalid) are all the permutations of the word ofish. These words are obtained by scrambling the letters in ofish.