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This website has a horrible user experience especially for iPad it is a buggy mess I use the keyboard on the iPad every time I tap a letter the keyboard disappears also the matchbook is overpriced you have to pay seventy dollars just to access the matchbook when you can get all this for free. In conclusion this website is a buggy mess and charges a racket for information you can get for free.
Tip for consumers:
I would recommend to use khan academy and learn this same information for free.
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