1. http://serpiko.tistory.com/382
2. HTML5 Canvas: Lunch Wheel
https://blog.bramp.net/post/2011/07/27/html5-canvas-lunch-wheel/
3. http://www.dougtesting.net/winwheel
4. http://www.html5canvastutorials.com/labs/html5-canvas-wheel-of-fortune/

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