Hello, I solved this mission with some hints.
Here I report a point to improve on the mission introduction.
The introduction says:
Your mission is to figure out which country opens your emails the most.
But, this is also said:
Output: String, Two-digit country code of country that has more unique clicks.
Actually, this is confusing because there exists both opens and unique_clicks in the response.
Thus, I suggest to change the introduction message such as:
Your mission is to figure out which country has most unique clicks to your emails.
Created at: 2017/09/06 16:11; Updated at: 2017/09/06 16:11