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# Regina - A Normal Surface Theory Calculator
# Python Test Suite Component
#
# Copyright (c) 2007-2025, Ben Burton
# For further details contact Ben Burton (bab@debian.org).
#
# Provides various tests for group presentation.
#
# This file is a single component of Regina's python test suite. To run
# the python test suite, move to the main python directory in the source
# tree and run "make check".
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2 of the
#
# As an exception, when this program is distributed through (i) the
# App Store by Apple Inc.; (ii) the Mac App Store by Apple Inc.; or
# (iii) Google Play by Google Inc., then that store may impose any
# digital rights management, device limits and/or redistribution
# restrictions that are required by its terms of service.
# 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
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
e = GroupExpression('a^7dB^2D')
print(e)
print(e.inverse())
print(e.power(-2))
print(e.power(-1))
print(e.power(0))
print(e.power(1))
print(e.power(2))
dummy = e.substitute(3, GroupExpression('Eg'))
print(e)
dummy = e.substitute([GroupExpression('aB'), \
GroupExpression('c'), \
GroupExpression(''), \
GroupExpression('B^2'), \
GroupExpression('A'), \
GroupExpression('g'), \
GroupExpression('f')])
print(e)
e = GroupExpression('a^7dB^2D')
e.addTermsLast(GroupExpression('c^2D'))
e.addTermsFirst(GroupExpression('E^2f'))
print(e)
e = GroupExpression('a^7dB^2D')
e.addTermsFirst(e)
e.addTermsLast(e)
print(e)
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