C21221212121211331313233313131133132333132313223313232213232221   >>    C2122121212121133131323331313113313233313231322331323221323222   <<    C21221212121211331313233313131133132333132313223313232213232223   >>      C21221212121211331313233313131133132333132313223313232213232222   >>