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 The Americans with Disabilities Act of 1990 (ADA ), 104 Stat. 328, 42 U.S.C. § 12101 et seq., prohibits certain employers from discriminating against individuals on the basis of their disabilities. See § 12112(a). It provides that no covered employer 'shall discriminate against a qualified individual with a disability because of the disability of such individual in regard to job application procedures, the hiring, advancement, or discharge of employees, employee compensation, job training, and other terms, conditions, and privileges  of employment.' 42 U.S.C. § 12112(a); see also § 12111(2) ('The term 'covered entity' means an employer, employment agency, labor organization, or joint ...