rubby urbby rbuby bruby ubrby burby rubby urbby rbuby bruby ubrby burby rbbuy brbuy rbbuy brbuy bbruy bbruy ubbry bubry ubbry bubry bbury bbury rubyb urbyb rbuyb bruyb ubryb buryb ruybb urybb ryubb yrubb uyrbb yurbb rbyub bryub rybub yrbub byrub ybrub ubyrb buyrb uybrb yubrb byurb yburb rubyb urbyb rbuyb bruyb ubryb buryb ruybb urybb ryubb yrubb uyrbb yurbb rbyub bryub rybub yrbub byrub ybrub ubyrb buyrb uybrb yubrb byurb yburb rbbyu brbyu rbbyu brbyu bbryu bbryu rbybu brybu rybbu yrbbu byrbu ybrbu rbybu brybu rybbu yrbbu byrbu ybrbu bbyru bbyru bybru ybbru bybru ybbru ubbyr bubyr ubbyr bubyr bbuyr bbuyr ubybr buybr uybbr yubbr byubr ybubr ubybr buybr uybbr yubbr byubr ybubr bbyur bbyur bybur ybbur bybur ybbur
Note: these 'words' (valid or invalid) are all the permutations of the word rubby. These words are obtained by scrambling the letters in rubby.