Given an array \(A\) of \(N\) integers. Find out the minimum value of the following expression for all valid \(i,j\).

\((A_i \ and \ A_j) \ xor \ (A_i \ or \ A_j)\), where \(i \ne j\).

Video approach to solve this question: here

Input format

First line: A single integer \(T\) denoting the number of test cases
For each test case:
- First line contains a single integer \(N\), denoting the size of the array.
- Second line contains \(N\) space separated integers \(A_1,A_2,...,A_n\)

Output format

For each test case, print a single line containing one integer that represents the minimum value of the given expression

Constraints

\(1 \le T \le 10^3\\ 1 \le N \le 10^5\\ 0 \le A_i \le 10^9\)

Note: Sum of \(N\) overall test cases does not exceed \(10^6\)