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### 2 Installation and Help of the PERMUT Package

Since all functions of this package are written in the GAP language, it is enough to unpack the archive file in a directory in the pkg hierarchy of your GAP 4 distribution. It has been tested on version 4.7.4 of GAP.

The PERMUT package requires that the package Format [EW03] be installed on the system, because it uses the functions PResidual (FORMAT: PResidual) and SystemNormalizer (FORMAT: SystemNormalizer) which are defined there. The Format package can be downloaded from the GAP web page (https://www.gap-system.org).

The PERMUT package can be loaded with

gap> LoadPackage("permut");
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by Bettina Eick (http://www.icm.tu-bs.de/~beick) and
Charles R.B. Wright (http://www.uoregon.edu/~wright).
Homepage: http://www.uoregon.edu/~wright/RESEARCH/format/
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Loading  permut 2.0.3 (PERMUT: A package to deal with permutability in finite groups)