C21221212121211331313233313131133132333132313223313231313232111   >>    C2122121212121133131323331313113313233313231322331323131323211   <<    C21221212121211331313233313131133132333132313223313231313232113   >>      C21221212121211331313233313131133132333132313223313231313232112   >>