tnhub nthub thnub htnub nhtub hntub tnuhb ntuhb tunhb utnhb nuthb unthb thunb htunb tuhnb uthnb hutnb uhtnb nhutb hnutb nuhtb unhtb huntb uhntb tnhbu nthbu thnbu htnbu nhtbu hntbu tnbhu ntbhu tbnhu btnhu nbthu bnthu thbnu htbnu tbhnu bthnu hbtnu bhtnu nhbtu hnbtu nbhtu bnhtu hbntu bhntu tnubh ntubh tunbh utnbh nutbh untbh tnbuh ntbuh tbnuh btnuh nbtuh bntuh tubnh utbnh tbunh btunh ubtnh butnh nubth unbth nbuth bnuth ubnth bunth thubn htubn tuhbn uthbn hutbn uhtbn thbun htbun tbhun bthun hbtun bhtun tubhn utbhn tbuhn btuhn ubthn buthn hubtn uhbtn hbutn bhutn ubhtn buhtn nhubt hnubt nuhbt unhbt hunbt uhnbt nhbut hnbut nbhut bnhut hbnut bhnut nubht unbht nbuht bnuht ubnht bunht hubnt uhbnt hbunt bhunt ubhnt buhnt
Note: these 'words' (valid or invalid) are all the permutations of the word tnhub. These words are obtained by scrambling the letters in tnhub.