English: We counted the words of abstracts of simple english and english wikipedia as of the 2016 august first data dump. And then ranked them by the top words. we asked ourself what is the percentage of sentences that can be understood given a certain vocabulary. One can see that every second sentence in simple english can be understood given a vocab of around 18'000 words. For the english wikipedia around 39'000 words are needed to be able to understand every second scentence. So Simple english wikipedia seems indeed to be easy to understand.
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