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`chpp' is a preprocessor. Therefore, its main purpose is to modify
input text by including other input files and by macro expansion.
What distinguishes `chpp' from other textprocessors are mainly two
features:
* `chpp' is non-intrusive. This means that you can take your
favorite text and it is very unlikely that it will be changed when
piped through `chpp'. Due to this feature it is pretty easy to
start using `chpp' since you can just start writing your text and
need not concern yourself with `chpp' sitting in the background
changing it for no obvious reason.
* `chpp' is not just a package for performing simple macro expansion,
but can indeed be considered a full-fledged programming language.
Most importantly, it provides support for complex data structures,
namely lists and hashes (associative arrays), which can be nested
arbitrarily.
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