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gawk: Constants

 6.1.1 Constant Expressions
 The simplest type of expression is the "constant", which always has the
 same value.  There are three types of constants: numeric, string, and
 regular expression.
    Each is used in the appropriate context when you need a data value
 that isn't going to change.  Numeric constants can have different forms,
 but are internally stored in an identical manner.


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