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"$pdq$"$\in {\mathrm{E}\mathrm{x}\mathrm{t}}_{𝒞}^{k-1}(𝒞{\Lambda }^1,𝒞\mathrm{D}\mathrm{i}\mathrm{f}\mathrm{f}({\overline{\Lambda }}^n,𝒞{\Lambda }^1\otimes {\overline{\Lambda }}^{n-k-1}))$

where $k$ is the number of the lines.