T = gets.to_i

T.times do |t|
  n = gets.to_i
  cards = Hash.new { |h, k| h[k] = [] }

  n.times do
    c, d = gets.chomp.split
    d = d.to_i

    cards[c] << d
  end

  if t == 882
    # pp cards
  end

  # pp cards
  if cards.size == 1
    puts 'YES'
  else
    ok = false

    ['R', 'G', 'B'].permutation(3).each do |i, j, k|
      e1 = cards[i] & cards[j]
      e2 = cards[j] & cards[k]

      if e1.size >= 2 && e2.size >= 2
        ok = true
      elsif e1.size >= 2 && e2.size >= 1
        ok = true
      elsif e1.size >= 1 && e2.size >= 1 && (e1 | e2).size >= 2
        ok = true
      elsif e1.size >= 1 && e2.size >= 1 && (cards[j].size == 1 || cards[k].size == 1)
        ok = true
      elsif e1.size >= 1 && cards[k].size == 0
        ok = true
      end
      # pp [cards[i] & cards[j], cards[j] & cards[k]]
    end

    if ok
      puts 'YES'
    else
      puts 'NO'
    end
  end
end