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To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

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Квадрати чисел

QuestionAnswer
1х1 1
2х2 4
3х3 9
4х4 16
5х5 25
6х6 36
7х7 49
8х8 64
9х9 81
10х10 100
11х11 121
12х12 144
13х13 '169
14х14 196
15х15 225
16х16 256
17х17 289
18х18 324
19х19 361
20х20 400
Created by: anastasij