* http://www.tug.org/utilities/plain/cseq.html
* ÁÖ·Î backslash(`\`)·Î ½ÃÀÛÇÑ´Ù. escape character
* Control Words
* {{{\}}}
* µÚ¿¡ µû¸£´Â °ø¹éÀ» ¾ø¾Ö¹ö¸°´Ù. °ø¹éÀ» À¯ÁöÇϱâ À§ÇØ `{}`³ª control space( $$\backslash\verb*| |$$ )¸¦ »ç¿ëÇ϶ó.
* Control Symbols
* {{{\}}}
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cf. PrimitiveControlSequences