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#include <bits/stdc++.h>
using namespace std;
ifstream fin("restante.in");
ofstream fout("restante.out");
char a[36002][17];
int cmp(const void *x,const void *y)
{
return strcmp((char*)x,(char*)y);
}
int cnt=0;
int main()
{
int n;
fin>>n;
for(int i=0;i<n;i++)
{
fin>>a[i];
int m=strlen(a[i]);
sort(a[i], a[i]+m);
}
qsort(a,n,sizeof(a[0]),cmp);
for(int i=0;i<n;)
{
int j=i+1;
while(j<n and strcmp(a[i],a[j])==0)
j++;
if(j-i==1)
{
cnt++;
}
i=j;
}
fout<<cnt;
return 0;
}