#include<stdio.h>
#include<algorithm>
#include<string.h>
using namespace std;
char a[36001][17];
int N,k,s;
int main()
{
    freopen("restante.in","r",stdin);
    freopen("restante.out","w",stdout);
    scanf("%d",&N);
    for(int i=1;i<=N;++i)
    {
        scanf("%s",a[i]);
        k=strlen(a[i]);
        sort(a[i],a[i]+k);
    }
    for(int i=1;i<N;++i)
        for(int j=i+1;j<=N;++j)
            if(strcmp(a[i],a[j])==0)
            {
                ++s;
                break;
            }
    printf("%d",s);
    return 0;
}