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After you add words to your dictionary, you can practice them. Only words that aren't marked as known are included in the tests. Each time you get the answer right, a counter for the word is decreased, and when you get the answer wrong, it is increased. When the counter reaches 0, the website will automatically mark the word as known, and it won't appear again in practice tests.
Notice that on top of the page, you can select the time frame for your words. You can select between "All words" or words modified in one of the timeframes available.