ysihd syihd yishd iyshd siyhd isyhd yshid syhid yhsid hysid shyid hsyid yihsd iyhsd yhisd hyisd ihysd hiysd sihyd ishyd shiyd hsiyd ihsyd hisyd ysidh syidh yisdh iysdh siydh isydh ysdih sydih ydsih dysih sdyih dsyih yidsh iydsh ydish dyish idysh diysh sidyh isdyh sdiyh dsiyh idsyh disyh yshdi syhdi yhsdi hysdi shydi hsydi ysdhi sydhi ydshi dyshi sdyhi dsyhi yhdsi hydsi ydhsi dyhsi hdysi dhysi shdyi hsdyi sdhyi dshyi hdsyi dhsyi yihds iyhds yhids hyids ihyds hiyds yidhs iydhs ydihs dyihs idyhs diyhs yhdis hydis ydhis dyhis hdyis dhyis ihdys hidys idhys dihys hdiys dhiys sihdy ishdy shidy hsidy ihsdy hisdy sidhy isdhy sdihy dsihy idshy dishy shdiy hsdiy sdhiy dshiy hdsiy dhsiy ihdsy hidsy idhsy dihsy hdisy dhisy
Note: these 'words' (valid or invalid) are all the permutations of the word ysihd. These words are obtained by scrambling the letters in ysihd.