European Commission President Jean-Claude Juncker walked away from his meeting with President Donald Trump on Wednesday with a freshly won trade detente, and he may have had flash cards to thank.

The Wall Street Journal reported Thursday that Juncker came to the meeting in Washington well-prepared, with “more than a dozen colorful cue cards with simplified explainers,” such as numbers and factoids about complex topics including automotive trade. Each easy-to-read card had, at most, three figures, a senior European Union official told the Journal.