ofays foays oafys aofys faoys afoys ofyas foyas oyfas yofas fyoas yfoas oayfs aoyfs oyafs yoafs ayofs yaofs fayos afyos fyaos yfaos ayfos yafos ofasy foasy oafsy aofsy faosy afosy ofsay fosay osfay sofay fsoay sfoay oasfy aosfy osafy soafy asofy saofy fasoy afsoy fsaoy sfaoy asfoy safoy ofysa foysa oyfsa yofsa fyosa yfosa ofsya fosya osfya sofya fsoya sfoya oysfa yosfa osyfa soyfa ysofa syofa fysoa yfsoa fsyoa sfyoa ysfoa syfoa oaysf aoysf oyasf yoasf ayosf yaosf oasyf aosyf osayf soayf asoyf saoyf oysaf yosaf osyaf soyaf ysoaf syoaf aysof yasof asyof sayof ysaof syaof fayso afyso fyaso yfaso ayfso yafso fasyo afsyo fsayo sfayo asfyo safyo fysao yfsao fsyao sfyao ysfao syfao aysfo yasfo asyfo sayfo ysafo syafo
Note: these 'words' (valid or invalid) are all the permutations of the word ofays. These words are obtained by scrambling the letters in ofays.