def main():
    import sys
    input = sys.stdin.read().split()
    ptr = 0
    N = int(input[ptr])
    ptr += 1
    Q = int(input[ptr])
    ptr += 1
    a = list(map(int, input[ptr:ptr+N]))
    ptr += N
    
    # Compute prefix XOR
    pre = [0] * (N + 1)
    for i in range(1, N+1):
        pre[i] = pre[i-1] ^ a[i-1]
    
    # Process each query
    for _ in range(Q):
        l = int(input[ptr])
        ptr += 1
        r = int(input[ptr])
        ptr += 1
        res = pre[r] ^ pre[l-1]
        print(res)
        
if __name__ == "__main__":
    main()