#include<bits/stdc++.h>
#define int long long
using namespace std;
constexpr int mod=1000000007;
int N,A[1<<20];
signed main(){
    cin>>N;
    map<int,int>mp;
    int n,ans=1; cin>>n;
    for(int i=1;i<N;i++){
        int a; cin>>a;
        int b=ans;
        (ans*=2)%=mod;
        (ans+=mod-mp[n])%=mod;
        (mp[n]+=b)%=mod;
        n^=a;
    }
    cout<<ans<<endl;
}