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1################################################################################ 1################################################################################
2# WeBWorK Online Homework Delivery System 2# WeBWorK Online Homework Delivery System
3# Copyright © 2000-2007 The WeBWorK Project, http://openwebwork.sf.net/ 3# Copyright © 2000-2007 The WeBWorK Project, http://openwebwork.sf.net/
4# $CVSHeader: pg/lib/PGcore.pm,v 1.3 2010/05/14 16:48:21 gage Exp $ 4# $CVSHeader: pg/lib/PGcore.pm,v 1.4 2010/05/15 18:41:23 gage Exp $
5# 5#
6# This program is free software; you can redistribute it and/or modify it under 6# This program is free software; you can redistribute it and/or modify it under
7# the terms of either: (a) the GNU General Public License as published by the 7# the terms of either: (a) the GNU General Public License as published by the
8# Free Software Foundation; either version 2, or (at your option) any later 8# Free Software Foundation; either version 2, or (at your option) any later
9# version, or (b) the "Artistic License" which comes with this package. 9# version, or (b) the "Artistic License" which comes with this package.
16package PGcore; 16package PGcore;
17 17
18use strict; 18use strict;
19BEGIN { 19BEGIN {
20 use Exporter; 20 use Exporter;
21 our @EXPORT_OK = qw( not_null); 21 our @EXPORT_OK = qw(not_null);
22} 22}
23our $internal_debug_messages = []; 23our $internal_debug_messages = [];
24 24
25our @ISA = qw(Exporter);
25use PGanswergroup; 26use PGanswergroup;
26use PGresponsegroup; 27use PGresponsegroup;
27use PGrandom; 28use PGrandom;
28use PGalias; 29use PGalias;
29use PGloadfiles; 30use PGloadfiles;

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