it is a funny thing, it is a mathematical problem which I have done before, but today I try to solve it again, then I couldn't do it.
in the end I finished it. All evening, I only did one mathematical problem,but I got it completely!

it is a funny thing, it is a mathematical problem which I have done before, but today I try to solve it again, then I couldn't do it.
in the end I finished it. All evening, I only did one mathematical problem,but I got it completely!
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