C21221212121211331313233313131133132333132313223313232213232213231311   >>    C2122121212121133131323331313113313233313231322331323221323221323131   <<    C21221212121211331313233313131133132333132313223313232213232213231313   >>      C21221212121211331313233313131133132333132313223313232213232213231312   >>