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Keywords:
Underscore,
Lowercase,
Alphanumeric,
Crlf,
Exclamation
a sequence of alphanumeric characters starting with a lowercase letter, or any sequence of characters enclosed in single quote marks
a sequence of any alphanumeric characters, hyphens, slashes, underscores, question marks, and exclamation marks
a sequence of ASCII characters delimited by SP or CRLF
a single character
a type of constant than generally begins with a lowercase letter or an underscore.
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