\item Given the set of clauses $C_{\phi} = \{ \{a,\lnot b\}, \{\lnot a, b, c\}, \{a, b, \lnot c\}, \{\lnot a, \neg b, \lnot c\} \}$ and the assignment $A = \{b\}$.
Compute $\varphi[A]$.

