#include <stdio.h>

#define HASH 1000003
const int Mod = 1000000007, H_Mod = HASH;

typedef struct List {
	struct List *next;
	int v, sum;
} list;

int main()
{
	int h, i, N, A, tmp = 0, sum = 1;
	list *hash[HASH] = {}, d[200001], *p;
	scanf("%d", &N);
	for (i = 1; i < N; i++) {
		scanf("%d", &A);
		tmp ^= A;
		h = tmp % H_Mod;
		for (p = hash[h]; p != NULL; p = p->next) if (p->v == tmp) break;
		if (p != NULL) {
			h = p->sum;
			p->sum = sum;
			sum = sum * 2 - h;
			if (sum >= Mod) sum -= Mod;
			else if (sum < 0) sum += Mod;
		} else {
			d[i].v = tmp;
			d[i].sum = sum;
			d[i].next = hash[h];
			hash[h] = &(d[i]);
			sum <<= 1;
			if (sum >= Mod) sum -= Mod;
		}
	}
	printf("%d\n", sum);
	fflush(stdout);
	return 0;
}