module HashUnion
  def union(hash)
    (self[:union] ||= []) << hash
    self
  end
 
  alias | union
  alias + union
end
 
module HashIntersection
  def intersection(hash)
    (self[:intersection] ||= []) << hash
    self
  end
 
  alias & intersection
end
 
def Conditions(hash)
  hash.extend(HashUnion)
  hash.extend(HashIntersection)
  hash
end
 
h = (Conditions(:hello => 1) | {:goodbye => 2} | {:ciao => 3}) & {:Sah_Yoh_Nah_Rah => 4}
 
puts h.inspect