import sys
sys.setrecursionlimit(10**8)

def f(i,j):
  if (i,j) not in d:
    d[(i,j)]=(f(i-1,j)+f(i-1,j+1))**2 % mod
  return d[(i,j)]

T=int(input())
for _ in range(T):
  n,m=map(int,input().split())
  mod=2**m
  L=list(map(int,input().split()))
  d=dict()
  for j in range(n):
    d[(0,j)]=L[j]
  print(f(n-1,0))