In the pixiv gallery this is from, this strip follows the two strips that were re-packaged (with a number added to top left corner) as no. 1 and 2 in Aningay's GF 4koma. However this post has not been so re-packaged and numbered, so it correct place in the pool order isn't clear. For now I put it between posts two and three.

Edit: Ignore, I'm blind, it's #12