I try to write Markdown in My problem (On Polygon), but I can only see the text (no Markdown) in preview.

I can't find "Create New Mashup" on the Mashup page.

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$$$\Huge{\text{Only For Chinese}}$$$

$$$\Huge{\text{The contest in Codeforces usually is 22:35 to 00:35 (for China). So if we need to attend these contest, we must sleep after 00:35. But we need to go to school next day, so we maybe not pay attention to teachers or sleep at school.}}$$$

$$$\Huge{\text{So, hope the Codeforces contest time starts early(18:00~19:00 is good)!!!!!!}}$$$