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

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

        take = take.sort.reverse
      end

      puts answer
    end
  end
end

Yukicoder.new