class Yukicoder
  def initialize
    t = gets.to_i

    t.times do
      n = gets.to_i
      l = gets.chomp.split.map(&:to_i)
      take = Hash.new(0)

      l.each do |i|
        take[i] += 1
      end

      take = take.values.sort.reverse

      answer = 0

      if take.size >= 3
        while take[2] > 0
          answer += 1
          take[0] -= 1
          take[1] -= 1
          take[2] -= 1

          take = take.sort.reverse
        end
      end

      puts answer
    end
  end
end

Yukicoder.new