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 “(1) (a) Subject to paragraph (b), for the purposes of this Part ‘A’ and ‘B’ represent 2 persons of opposite sex so that, where A is a woman, B is a man, and vice versa. 
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(b) For the purposes of this Part (except sections 19 and 20), where the treatment of a woman on a ground related to her pregnancy or maternity leave is, by virtue of section 6(2A), in issue, ‘B’ is either a man or a woman.”. 
 
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