标记符号相当与html的和h（n）取决于符号n个#

#h1 ##h2 ###h3 ####h4 #####h5 ######h6

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0 1 4

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this is a -------------------------

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this is ====================

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this is ==

标记快>

标记块测试1 1

标记块测试2

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1. red
2. blue
3. gree

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