(3) Let the universal set $U=\{x \mid x$ be a prime number not greater than 20 $\}, A \cap C_{U} B=\{3,5\}, B \cap C_{U} A=$ $\{7,19\},\left(\complement_{U} A\right) \cap\left(\complement_{U} B\right)=\{2,17\}$, find the sets $A$ and $B$.
(3) $A=\{3,5,11,13\}, B=\{7,11,13,19\}$