(d) Exactly one plant is completed by the contract date. O A N Az n Az O Ag U (A2 n A3) O (A1 N A2' N A3 )U (A,'N A, N A3)U (A,'N Az'N Az) O A n Az'n Az' O Ag U Az U Ag A Subscript[1/ 4 Subscript[2] A Subscript[1/ 4 Subscript[2] A Subscript[3] A Subscript[3] A Subscript[1 4 Subscript[2] A Subscript[1 A Subscript[2] A Subscript[3] A Subscript[3]

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