[05XI] Lemma 2.3.5. Given a pointed ∞\infty-operad 𝒪X\mathcal{O}_{X}, there is a homotopy equivalence 𝒪X,𝐒𝐒𝐞𝐪(n)≃Mul𝒪(X(n);X),\mathcal{O}_{X,\mathbf{SSeq}}(n)\simeq\operatorname{Mul}_{\mathcal{O}}(X^{(n)};X), which is natural in 𝒪X\mathcal{O}_{X}.