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problem@@-	problem	math problem	1
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problem@@1	problem	quandry	1
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problem@@1	problem	glitch	2
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problem@@-	problem	example	1
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problem@@-	problem	puzzle	1
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problem@@1	problem	diificulty	1
problem@@1	problem	mess	2
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problem@@1	problem	obstacle	13
problem@@-	problem	proposition	1
problem@@1	problem	difficulty	23