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+The title has two formats:  
+First: Use `=` or `-` ,with at least one symbol. 
+
+I am a first-level heading.
+=
+I am a second-level haeding.
+-  
+Second :Use `#`  
+One `#` represents first-level title,two represent second-level,and so on.**No more than six levels in total.**
+# I am a first-level heading. 
+## I am a second-level heading. 
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