4. Define "collusion"

During the summer of 2016 Rob Goldstone contacted Donald Trump Jr. in writing, by email. He explained in writing that:
a) he was acting as an intermediary for the Russian government and
b) the Russian government wanted to assist the Trump campaign to win the presidential election.
Eventually this email exchange was published by Donald Trump Jr., and the following quotes are taken directly from that correspondence.
Your job is to drag these actual quotes into the correct order in which they were sent. (We gave you the first and last quotes, so you only need to sleuth out the middle ones).