It doesn’t always work.
See example: I didn’t type the “a” hard enough.
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Generally it allows an incorrect answer whose Levenshtein distance is at most 3 from the correct answer. However, when the answer has a very short length, even one incorrect letter represents a fairly large deviation, so it gets a lot more unforgiving the shorter you get. A three-letter answer doesn’t have any leeway at all.
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The server has no way of knowing you wanted to type “math” and not “moth” or “smth”, for example (which would be more than just a bit off) 
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