Problem $3$

Assume that $(6.$ Grades$)$:

Find the following compound$1010q$:$11111010r$:$01011011s$: $11110000$

a$)$ notpvvq$r^{{?}^{?}}s$ propositions:

b$)$ notp$q^{{?}^{?}}{r}^{{?}^{?}}s$