(8) For sets $A$ and $B$, define the operation: $A-B=\{x \mid x \in A$, and $x \notin B\}$, and $A * B=$ $(A-B) \cup(B-A)$. Let $X=\{1,3,5,7\}, Y=\{x|| x \mid<4$, and $x \in \mathbf{Z}\}$, find $X * Y=$ $\qquad$.
(8) $\{-1,-2,-3,0,2,5,7\}$