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-rw-r--r--prolog/lexer.py16
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diff --git a/prolog/lexer.py b/prolog/lexer.py
index 712aa42..8f1a268 100644
--- a/prolog/lexer.py
+++ b/prolog/lexer.py
@@ -1,5 +1,21 @@
#!/usr/bin/python3
+# CodeQ: an online programming tutor.
+# Copyright (C) 2015 UL FRI
+#
+# This program is free software: you can redistribute it and/or modify it under
+# the terms of the GNU Affero General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+# FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
import ply.lex as lex
# LEXER