halfs ahlfs hlafs lhafs alhfs lahfs hafls ahfls hfals fhals afhls fahls hlfas lhfas hflas fhlas lfhas flhas alfhs lafhs aflhs falhs lfahs flahs halsf ahlsf hlasf lhasf alhsf lahsf haslf ahslf hsalf shalf ashlf sahlf hlsaf lhsaf hslaf shlaf lshaf slhaf alshf lashf aslhf salhf lsahf slahf hafsl ahfsl hfasl fhasl afhsl fahsl hasfl ahsfl hsafl shafl ashfl sahfl hfsal fhsal hsfal shfal fshal sfhal afshl fashl asfhl safhl fsahl sfahl hlfsa lhfsa hflsa fhlsa lfhsa flhsa hlsfa lhsfa hslfa shlfa lshfa slhfa hfsla fhsla hsfla shfla fshla sfhla lfsha flsha lsfha slfha fslha sflha alfsh lafsh aflsh falsh lfash flash alsfh lasfh aslfh salfh lsafh slafh afslh faslh asflh saflh fsalh sfalh lfsah flsah lsfah slfah fslah sflah
Note: these 'words' (valid or invalid) are all the permutations of the word halfs. These words are obtained by scrambling the letters in halfs.