C21221212121211331313233313131133132333132313223313231133132323221   >>    C2122121212121133131323331313113313233313231322331323113313232322   <<    C21221212121211331313233313131133132333132313223313231133132323223   >>      C21221212121211331313233313131133132333132313223313231133132323222   >>