Answer:
The M22 graph, also called the Mesner graph, is the unique strongly regular graph with parameters (77, 16, 0, 4). ... It is one of seven known triangle-free strongly regular graphs. Its graph spectrum is (−6)21255161, and its automorphism group is the Mathieu group M22.
Explanation:
I had to calculate the answer and look throw my text book to find it out.