xedfa exdfa xdefa dxefa edxfa dexfa xefda exfda xfeda fxeda efxda fexda xdfea dxfea xfdea fxdea dfxea fdxea edfxa defxa efdxa fedxa dfexa fdexa xedaf exdaf xdeaf dxeaf edxaf dexaf xeadf exadf xaedf axedf eaxdf aexdf xdaef dxaef xadef axdef daxef adxef edaxf deaxf eadxf aedxf daexf adexf xefad exfad xfead fxead efxad fexad xeafd exafd xaefd axefd eaxfd aexfd xfaed fxaed xafed axfed faxed afxed efaxd feaxd eafxd aefxd faexd afexd xdfae dxfae xfdae fxdae dfxae fdxae xdafe dxafe xadfe axdfe daxfe adxfe xfade fxade xafde axfde faxde afxde dfaxe fdaxe dafxe adfxe fadxe afdxe edfax defax efdax fedax dfeax fdeax edafx deafx eadfx aedfx daefx adefx efadx feadx eafdx aefdx faedx afedx dfaex fdaex dafex adfex fadex afdex
Note: these 'words' (valid or invalid) are all the permutations of the word xedfa. These words are obtained by scrambling the letters in xedfa.