import std.stdio;
import std.algorithm;
import std.math;
import std.conv;
import std.string;

T readNum(T)(){
  return readStr.to!T;
}

T[] readNums(T)(){
  return readStr.split.to!(T[]);
}

string readStr(){
  return readln.chomp;
}

void main(){
  auto n = readNum!int;
  auto str = new string[](n);
  foreach(ref s; str){
    s = readStr.representation.dup.sort.to!string;
  }

  int ret;
  foreach(i, ref s; str){
    foreach(ref t; str[i+1 .. $]){
      if(s == t) ret++;
    }
  }

  writeln(ret);
}