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(a) Subsection (b) of § 1327 of this title provides that merit or seniority systems may be established and classifications may be made according to sex if this is a 'bona fide job requirement' for said specific job. To this purpose, we deem that job policies are unfair when they arbitrarily classify jobs to:\n(1) Prohibit a woman from applying for a job classified 'for men', or a job on the assembly line for 'men', and vice versa.\n(2) Prohibit a man who is to be suspended to displace a woman with less seniority on a 'women’s seniority list', and vice versa.\n(b) A seniority or merit system which establishes a difference between 'light and heavy' work is an unfair labor practice if it operates as a means to disguise a classification by sex, or establishes unreasonable obstacles to the progress of members of either sex for jobs that either sex could reasonably perform.\nHistory —July 6, 1985, No. 69, p. 236, § 9.