byoft yboft boyft obyft yobft oybft byfot ybfot bfyot fbyot yfbot fybot bofyt obfyt bfoyt fboyt ofbyt fobyt yofbt oyfbt yfobt fyobt ofybt foybt byotf ybotf boytf obytf yobtf oybtf bytof ybtof btyof tbyof ytbof tybof botyf obtyf btoyf tboyf otbyf tobyf yotbf oytbf ytobf tyobf otybf toybf byfto ybfto bfyto fbyto yfbto fybto bytfo ybtfo btyfo tbyfo ytbfo tybfo bftyo fbtyo btfyo tbfyo ftbyo tfbyo yftbo fytbo ytfbo tyfbo ftybo tfybo bofty obfty bfoty fboty ofbty fobty botfy obtfy btofy tbofy otbfy tobfy bftoy fbtoy btfoy tbfoy ftboy tfboy oftby fotby otfby tofby ftoby tfoby yoftb oyftb yfotb fyotb ofytb foytb yotfb oytfb ytofb tyofb otyfb toyfb yftob fytob ytfob tyfob ftyob tfyob oftyb fotyb otfyb tofyb ftoyb tfoyb
Note: these 'words' (valid or invalid) are all the permutations of the word byoft. These words are obtained by scrambling the letters in byoft.