class A:
  def __init__(self, a, b):
    self.a = a
    self.b = b
  def __repr__(self):
    return "["+str(self.a)+","+str(self.b)+"]"
  def __eq__(self, oth):
    if self.a == oth.a and self.b == oth.b:
      return False
    return True
  def __ne__(self,oth):
    return not self == oth
  def __hash__(self):
    return self.a*1000+self.b

a = set()
a.add(A(1,2))
a.add(A(2,2))
a.add(A(1,2))

for i in a:
  print i,hash(i)
print a