C21221212121211331313233313131133132333132313223313231333132233121   >>    C2122121212121133131323331313113313233313231322331323133313223312   <<    C21221212121211331313233313131133132333132313223313231333132233123   >>      C21221212121211331313233313131133132333132313223313231333132233122   >>