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