Learn: Major System
See the number. Recall the word. Tap to check. No peeking.
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看数字，想象词语，点击查看。方向键也可用。
The first 12 pairs cover the first four six-digit scenes of pi: 314159, 265358, 979323, 846264.
Learn those 12 words and you have the story for the first 24 digits. Then add the next scene.
