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 Section 206(d)(1) establishes this rule: 'No employer . . .shall discriminate . . . between employees on the basis of sex by paying wages to employees in such establishment at a rate less than the rate at which he pays wages to employees of the opposite sex in such establishment for equal work on jobs the performance of which requires equal skill, effort, and responsibility, and which are performed under similar working conditions'. Wernsing observes that she performs the same tasks as Bingaman, under the same working conditions, yet is paid substantially less; it follows, she contends, that the Department must raise ...