You can access the content on multiple mobile devices by selecting "Purchase Full Content" from the menu and restoring the purchase on your second device. If this doesn't work, you should go through the process of purchasing the full content again. But don't worry, as long as you use the same Apple or Google Play ID you used for your original order, you will not be charged again.
The "Log In" option is only for customers who did not make the full in-app purchase, and instead purchased the physical flashcards from our website.
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