Received and acknowledged your letter of April 15 from Comrade Ouyang Mingshan’s factory. At present, I am not yet in a position to respond to the questions you have raised; I will need to study the matter further. If you are collecting materials, that is most welcome—please gather both favorable and unfavorable evidence. It would be ideal if you could provide me with a concise explanatory note. I wonder whether the comrades in the Literature and Art Office have the time to undertake this task?  Respectfully,  Mao Zedong  April 17