You are given an undirected tree $$G$$ with $$N$$ nodes. You are also given an array $$A$$ of $$N$$ integer elements where $$A[i]$$ represents the value assigned to node $$i$$ and an integer $$K$$.

You can apply the given operation on the tree at most once:

• Select a node $$x$$ in the tree and consider it as the root of the tree.
• Select a node $$y$$ in the tree and update the value of each node in the subtree of $$y$$ by taking its XOR with $$K$$. That is, for each node $$u$$ in the subtree of node $$y$$, set $$A[u] = A[u] XOR K$$.

Find the maximum sum of values of nodes that are available in the tree, after the above operation is used optimally.

Note

• Assume 1-based indexing.
• XOR represents the bitwise XOR operator. 

Input format

• The first line contains a single integer $$T$$ that denotes the number of test cases.
• For each test case:
  • The first line contains an integer $$N$$.
  • The second line contains an integer $$K$$.
  • The third line contains $$N$$ space-separated integers denoting array $$A$$.
  • Next $$N - 1$$ lines contain two space-separated integers denoting an edge between node $$u$$ and $$v$$.

Output format

For each test case, print the maximum possible sum of values of nodes present in the tree. Print the output for each test case in a new line.

Constraints