|  | ANSI Common Lisp  22 Printer  22.2 The Lisp Pretty Printer  22.2.1 Pretty Printer Concepts 22.2.1.3   Compiling Format StringsA format string is essentially a program in a special-purpose language
that performs printing, and that is interpreted by the function format.
The formatter macro provides the efficiency of using a compiled function 
to do that same printing but without losing the textual compactness of format strings.
A format control is either a format string or a function
that was returned by the the formatter macro.
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