n = gets.to_i
if n < 100000
  i = 0
  words = []
  while i < n do
      word = gets.split("")
      word_count = Hash.new(0)
      word.each do |e|
          word_count[e] += 1
      end
      word_count.delete("\n")
      i += 1
      words << word_count.sort_by{|key, val| key}
  end

  a = 0
  b = 1
  match_count = 0
  while a < n do
      while b < n + 1 do
          match_count += 1 if words[a] == words[b]
          b += 1
      end
      a += 1
      b = a + 1
  end
  puts match_count
end