What are the contents of the letter Pip receives in chapter 52 of "Great Expectations"?

Pip receives two letters in this chapter. The first is from Wemmick, and it concerns "you might do what you know." Then he is instructed to burn it. This letter is in reference to the plan for Provis. The second letter is dirty and unsigned and instructs Pip to be at the sluice-house at 9:00, and this also concerns Uncle Provis. However, the second letter serves as a trap by Orlick to wreak his revenge on Pip!