I received a letter from Chang Geng, thanks to Crow. He did mention that we should make sure to sign our letters as apparently some have come through un-signed. Ah... other than that, we should make sure to keep talking about them as well.

If we have questions, we should ask the Residents or even just questions in general, we should ask them aloud, even if we don't have answers. They're able to try and search for the answers on their side as well and do their best to send answers to us in their own letters, which seem to be redacted in certain parts. Likely something that can't be transmitted from different sides of the prism.

I think it may be a good idea to send them the symbols from the compass as well? To see if anything makes sense on their part?