The Code 777 cards have a diagram showing all the possible numbers in the game in the right color.
Diagrams are also printed on the notepad sheets. How to best use the Notepad is completely up to the players, since each player will want to take notes on the questions and their potential guesses in a different way.
However, as a general rule of thumb, you might consider using the Notepad as such:
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In the Pyramid of numbers, scratch off any tiles you can see. You know you don't have any of the tiles you can see. …