#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int char_cmp(const void *x, const void *y) {
    int d;
    d = *((char*)x) - *((char*)y);
    if(d < 0)
        return -1;
    if(d > 0)
        return 1;
    return 0;
}

int str_cmp(const void *x, const void *y) {
    int d;
    d = *(*((char**)x)) - *(*((char**)y));
    if(d < 0)
        return -1;
    if(d > 0)
        return 1;
    return strcmp(*((char**)x) + 1, *((char**)y) + 1);
}

int main() {
    int n, i, j, v;
    char x;
    char tmp[17];
    char **cuv;
    FILE *f;
    f = fopen("restante.in", "r");
    fscanf(f, "%d\n", &n);
    cuv = (char**)malloc(n * sizeof(char*));
    for(i = 0; i < n; i++) {
        fscanf(f, "%s\n", tmp);
        qsort(tmp, strlen(tmp), sizeof(char), char_cmp);
        cuv[i] = (char*)malloc((strlen(tmp) + 2) * sizeof(char));
        strcpy(cuv[i] + 1, tmp);
        x = 0;
        for(j = 0; j < strlen(tmp); j++)
            x ^= tmp[j];
        *(cuv[i]) = x;
        /*printf("am citit %s\n", tmp);*/
    }
    fclose(f);
    qsort(cuv, n, sizeof(char*), str_cmp);
    /*for(i = 0; i < n; i++)
        printf("cuv %d este [%x:%s]\n", i, *(cuv[i]), cuv[i] + 1);*/
    v = 0;
    i = 0;
    while(i < n) {
        j = i + 1;
        while(j < n && *(cuv[i]) == *(cuv[j]) &&
            strcmp(cuv[i] + 1, cuv[j] + 1) == 0)
            j++;
        if(j - i == 1)
            v++;
        i = j;
    }
    for(i = 0; i < n; i++)
        free(cuv[i]);
    free(cuv);
    f = fopen("restante.out", "w");
    fprintf(f, "%d\n", v);
    fclose(f);
    return 0;
}