Let k be a field, and A, B is subscheme of C over k, F is a sheaf over C.

**Question 1.** what is the relation between $H_c(A\cap B,k)$, $H_c(B,F)$, and $H_c(A\cap B,F)$ ?

**Question 2.** Let A be a strata of a stratification over C, F be a perverse sheaf over C. How can we construct a spectral sequence $H_c^m(A,H^k(F)) \to H_c^{m+k}(A,F)$,
where $H^k(F)$ is the hyper-cohomology.