C21221212121211331313233313131133132333132313223313231323221333221   >>    C2122121212121133131323331313113313233313231322331323132322133322   <<    C21221212121211331313233313131133132333132313223313231323221333223   >>      C21221212121211331313233313131133132333132313223313231323221333222   >>