bubsu ubbsu bbusu bbusu ubbsu bubsu busbu ubsbu bsubu sbubu usbbu subbu bbsuu bbsuu bsbuu sbbuu bsbuu sbbuu ubsbu busbu usbbu subbu bsubu sbubu bubus ubbus bbuus bbuus ubbus bubus buubs ububs buubs ububs uubbs uubbs bbuus bbuus bubus ubbus bubus ubbus ububs buubs uubbs uubbs buubs ububs busub ubsub bsuub sbuub usbub subub buusb ubusb buusb ubusb uubsb uubsb bsuub sbuub busub ubsub subub usbub usubb suubb uusbb uusbb suubb usubb bbsuu bbsuu bsbuu sbbuu bsbuu sbbuu bbusu bbusu bubsu ubbsu bubsu ubbsu bsubu sbubu busbu ubsbu subbu usbbu bsubu sbubu busbu ubsbu subbu usbbu ubsub busub usbub subub bsuub sbuub ubusb buusb uubsb uubsb buusb ubusb usubb suubb uusbb uusbb suubb usubb bsuub sbuub busub ubsub subub usbub
Note: these 'words' (valid or invalid) are all the permutations of the word bubsu. These words are obtained by scrambling the letters in bubsu.