| he or she has opposed that which he or she reasonably and in good faith believes to be unlawful discrimination, sexual harassment in employment, sexual harassment in elementary, secondary, and higher education, or discrimination based on arrest record, citizenship status, or work authorization status in employment under Articles 2, 4, 5, and 5A, because he or she has made a charge, filed a complaint, testified, assisted, or participated in an investigation, proceeding, or hearing under this Act, or because he or she has requested, attempted to request, used, or attempted to use a reasonable accommodation as allowed by this Act;
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