C21221212121211331313233313131133132333132313223313232213231111   >>    C2122121212121133131323331313113313233313231322331323221323111   <<    C21221212121211331313233313131133132333132313223313232213231113   >>      C21221212121211331313233313131133132333132313223313232213231112   >>