This problem is about a little pig named Benny. Benny was given an array of N integers and another separate integer X. Benny has to find the number of subsets (not necessarily contiguous) of A such that Bitwise XOR of all elements contained within the subset evaluates to X.

Probably, you have already guessed that she missed a lot of classes and is not able to solve her homework now. Therefore, she asks you to help her. Find the number of subsets of A such that Bitwise XOR of all elements of the subset will be equal to X.

Input format

The first line of the input contains two space separated integers, N and X.

The next line contains N integers denoting the array A.

Output format

Print in a single line an answer to the problem. As the answer might be large, output it modulo 10⁷ + 7.

Constraints

• 1 ≤ N ≤ $10$³
• 0 ≤ A_i ≤ 2^$20$

Note
The amount of A_i > 2^$10$ is not more than $20$.