C21221212121211331313233313131133132333132313223313231323233231323221211   >>    C2122121212121133131323331313113313233313231322331323132323323132322121   <<    C21221212121211331313233313131133132333132313223313231323233231323221213   >>      C21221212121211331313233313131133132333132313223313231323233231323221212   >>