whafs hwafs wahfs awhfs hawfs ahwfs whfas hwfas wfhas fwhas hfwas fhwas wafhs awfhs wfahs fwahs afwhs fawhs hafws ahfws hfaws fhaws afhws fahws whasf hwasf wahsf awhsf hawsf ahwsf whsaf hwsaf wshaf swhaf hswaf shwaf washf awshf wsahf swahf aswhf sawhf haswf ahswf hsawf shawf ashwf sahwf whfsa hwfsa wfhsa fwhsa hfwsa fhwsa whsfa hwsfa wshfa swhfa hswfa shwfa wfsha fwsha wsfha swfha fswha sfwha hfswa fhswa hsfwa shfwa fshwa sfhwa wafsh awfsh wfash fwash afwsh fawsh wasfh awsfh wsafh swafh aswfh sawfh wfsah fwsah wsfah swfah fswah sfwah afswh faswh asfwh safwh fsawh sfawh hafsw ahfsw hfasw fhasw afhsw fahsw hasfw ahsfw hsafw shafw ashfw sahfw hfsaw fhsaw hsfaw shfaw fshaw sfhaw afshw fashw asfhw safhw fsahw sfahw
Note: these 'words' (valid or invalid) are all the permutations of the word whafs. These words are obtained by scrambling the letters in whafs.