“A Rotating Fan" is a speed sense puzzle.

HOW TO PLAY?
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1. Observing the graphs of the target animation.

2. The horizontal coordinate represents time and the vertical coordinate represents the area of the sector.

3. Each color line is defined as follows:
Yellow, the area of a yellow sector
Black, the area of a black sector
Red, the area of yellow and black sectors combined.
Green, the area of yellow and black sectors intersect.

4. You need to find the exact sector animation corresponding to the area curve in the response area to succeed in the challenge.


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