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 14 Fast loading of frozen state
 *******************************
 
 Some bigger `m4' applications may be built over a common base
 containing hundreds of definitions and other costly initializations.
 Usually, the common base is kept in one or more declarative files,
 which files are listed on each `m4' invocation prior to the user's
 input file, or else each input file uses `include'.
 
    Reading the common base of a big application, over and over again,
 may be time consuming.  GNU `m4' offers some machinery to speed up the
 start of an application using lengthy common bases.
 

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