wheft hweft wehft ewhft hewft ehwft whfet hwfet wfhet fwhet hfwet fhwet wefht ewfht wfeht fweht efwht fewht hefwt ehfwt hfewt fhewt efhwt fehwt whetf hwetf wehtf ewhtf hewtf ehwtf whtef hwtef wthef twhef htwef thwef wethf ewthf wtehf twehf etwhf tewhf hetwf ehtwf htewf thewf ethwf tehwf whfte hwfte wfhte fwhte hfwte fhwte whtfe hwtfe wthfe twhfe htwfe thwfe wfthe fwthe wtfhe twfhe ftwhe tfwhe hftwe fhtwe htfwe thfwe fthwe tfhwe wefth ewfth wfeth fweth efwth fewth wetfh ewtfh wtefh twefh etwfh tewfh wfteh fwteh wtfeh twfeh ftweh tfweh eftwh fetwh etfwh tefwh ftewh tfewh heftw ehftw hfetw fhetw efhtw fehtw hetfw ehtfw htefw thefw ethfw tehfw hftew fhtew htfew thfew fthew tfhew efthw fethw etfhw tefhw ftehw tfehw
Note: these 'words' (valid or invalid) are all the permutations of the word wheft. These words are obtained by scrambling the letters in wheft.