#include<stdio.h>
#include<stdlib.h>
#include<string.h>
int n,i,k,j;
char c[36][17];
int sort_function( const void *a, const void *b)
{	return (strcmp((char*)b,(char*)a));}

int main()
{	freopen("restante.in","r",stdin);
	freopen("restante.out","w",stdout);
	scanf("%d",&n);
	for(i=1;i<=n;i++)
	{	scanf("%s",&c[i]);
		qsort((void *)c[i], strlen(c[i]), sizeof(c[0][0]), sort_function);
	}
	//qsort((void*)c,n+1,sizeof(c[0]),sort_function);
	for(i=1;i<=n-1;i++)
		for(j=i+1;i<=n;i++)
			if(strcmp(c[i],c[j])!=0)	k++;
			else	k--;
	printf("%d",k);
}