14. The elements in set $X$ are positive integers, and have the property: if $x \in X$, then $12-x \in X$. The number of such sets $X$ is $\qquad$.
14.63.

Let $Y=\{(1,11),(2,10),(3,9),(4,8),(5,7), 6\}$. Therefore, the number of sets that satisfy the condition is $2^{6}-1=63$.