c8kbf and Tree

Chef _c8kbf_ has an unrooted, weighted tree with $N$ nodes, where vertices $u$ and $v$ are connected by an edge with weight $w$. The **value** of the simple path from $x$ to $y$ is defined as the [bitwise XOR](https://en.wikipedia.org/wiki/Bitwise_operation#XOR) of the weights of the edges it consists of. Recall that a simple path is a path that does not have repeating vertices. Help Chef _c8k