shoyu hsoyu sohyu oshyu hosyu ohsyu shyou hsyou syhou yshou hysou yhsou soyhu osyhu syohu ysohu oyshu yoshu hoysu ohysu hyosu yhosu oyhsu yohsu shouy hsouy sohuy oshuy hosuy ohsuy shuoy hsuoy suhoy ushoy husoy uhsoy souhy osuhy suohy usohy oushy uoshy housy ohusy huosy uhosy ouhsy uohsy shyuo hsyuo syhuo yshuo hysuo yhsuo shuyo hsuyo suhyo ushyo husyo uhsyo syuho ysuho suyho usyho yusho uysho hyuso yhuso huyso uhyso yuhso uyhso soyuh osyuh syouh ysouh oysuh yosuh souyh osuyh suoyh usoyh ousyh uosyh syuoh ysuoh suyoh usyoh yusoh uysoh oyush yoush ouysh uoysh yuosh uyosh hoyus ohyus hyous yhous oyhus yohus houys ohuys huoys uhoys ouhys uohys hyuos yhuos huyos uhyos yuhos uyhos oyuhs youhs ouyhs uoyhs yuohs uyohs
Note: these 'words' (valid or invalid) are all the permutations of the word shoyu. These words are obtained by scrambling the letters in shoyu.