import sys
mod = 10**9+7
data = sys.stdin.read().split()
n = int(data[0])
A = list(map(int, data[1:]))

last = {}
dp = [1]
px = 0
for i in range(1, n):
    px ^= A[i-1]
    v = dp[-1] * 2 % mod
    j = last.get(px)
    if j is not None:
        v = (v - dp[j-1]) % mod
    dp.append(v)
    last[px] = i

print(dp[-1])