C21221212121211331313233313131133132333132313223313232313232233221   >>    C2122121212121133131323331313113313233313231322331323231323223322   <<    C21221212121211331313233313131133132333132313223313232313232233223   >>      C21221212121211331313233313131133132333132313223313232313232233222   >>