C21221212121211331313233313131133132333132313223313232222331121   >>    C2122121212121133131323331313113313233313231322331323222233112   <<    C21221212121211331313233313131133132333132313223313232222331123   >>      C21221212121211331313233313131133132333132313223313232222331122   >>