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I've used other languages in this series and they're pretty good for practicing and repetition. This is the first time, however, that I bought the Kindle version this is the first time, however, that I bought the Kindle version. I do not recommend the Kindle version as the images do not always display and you can change the color of the page without throwing everything off. Also, the money you save in the e-book version you will end up spending and printing out all the exercises.