burnt ubrnt brunt rbunt urbnt rubnt bunrt ubnrt bnurt nburt unbrt nubrt brnut rbnut bnrut nbrut rnbut nrbut urnbt runbt unrbt nurbt rnubt nrubt burtn ubrtn brutn rbutn urbtn rubtn butrn ubtrn bturn tburn utbrn tubrn brtun rbtun btrun tbrun rtbun trbun urtbn rutbn utrbn turbn rtubn trubn buntr ubntr bnutr nbutr unbtr nubtr butnr ubtnr btunr tbunr utbnr tubnr bntur nbtur btnur tbnur ntbur tnbur untbr nutbr utnbr tunbr ntubr tnubr brntu rbntu bnrtu nbrtu rnbtu nrbtu brtnu rbtnu btrnu tbrnu rtbnu trbnu bntru nbtru btnru tbnru ntbru tnbru rntbu nrtbu rtnbu trnbu ntrbu tnrbu urntb runtb unrtb nurtb rnutb nrutb urtnb rutnb utrnb turnb rtunb trunb untrb nutrb utnrb tunrb nturb tnurb rntub nrtub rtnub trnub ntrub tnrub
Note: these 'words' (valid or invalid) are all the permutations of the word burnt. These words are obtained by scrambling the letters in burnt.