t = int(input())

for _ in range(t):
  n = int(input())
  r = set()
  g = set()
  b = set()
  for _ in range(n):
    c, d = input().split()
    if c == 'R':
      r.add(int(d))
    elif c == 'G':
      g.add(int(d))
    elif c == 'B':
      b.add(int(d))
  rg = len(r & g) > 0
  gb = len(g & b) > 0
  br = len(b & r) > 0
  re = len(r) == 0
  ge = len(g) == 0
  be = len(b) == 0
  if (re and ge) or (ge and be) or (be and re):
    print("YES")
  elif re:
    if gb:
      print("YES")
    else:
      print("NO")
  elif ge:
    if br:
      print("YES")
    else:
      print("NO")
  elif be:
    if rg:
      print("YES")
    else:
      print("NO")
  elif rg and gb:
    print("YES")
  elif gb and br:
    print("YES")
  elif br and rg:
    print("YES")
  else:
    print("NO")