Helps you memorize the significant digits of pi after "3.". Just say how many you think you know, and the app will tell you how many you got right, remind you of the last three correct digits and tell you the next three after that. Keep trying until you cancel. For example: User: 3.14
AoG: You got two right, the last three were 3.14 the next three are 159
User: 3.14159
AoG: You got five right, the last three were 159, the next three are 265
User: cancel
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