C21221212121211331313233313131133132333132313223313231333133313232211   >>    C2122121212121133131323331313113313233313231322331323133313331323221   <<    C21221212121211331313233313131133132333132313223313231333133313232213   >>      C21221212121211331313233313131133132333132313223313231333133313232212   >>