C21221212121211331313233313131133132333132313223313231323221331123221   >>    C2122121212121133131323331313113313233313231322331323132322133112322   <<    C21221212121211331313233313131133132333132313223313231323221331123223   >>      C21221212121211331313233313131133132333132313223313231323221331123222   >>