Fix grammaticality in this sentence: This reactor back then work on a positive void coefficient of reactivity.
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The's (1) is a positive value of the's (2) is a negative value of the's (3) is a negative value of the's (4) is a positive value of the's (5) is a positive's (6) is a negative's (7) is a negative's (8) is a negative's (9) is a positive's (10) is a positive's (11)