One could proceed as follows, for example: No colored dot on 12/20, so no Q post.
But there's plenty of posts on 02/18, the first one being about Obama and his 1.7 billion to Iran.
The task would be to connect (if possible & plausible) the posts on 04/19 with those on 02/18, so that they maybe fit together.
If 02/18 gives other markers, one would follow those and maybe in this manner "build the map".