Lemma 22.28.4. Let R be a ring. Let (A, \text{d}) and (B, \text{d}) be differential graded R-algebras. Let M be a differential graded (A, B)-bimodule. There exists a homomorphism P \to M of differential graded (A, B)-bimodules which is a quasi-isomorphism such that P has property (P) as defined above.
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