Discriminated Union Create a discriminated union for Coordinates that can be a Tuple, Threeple or Fourple that represent tuples of size two, three and four. The type for the union should be polymorphic. Instantiate a Tuple of integers, a Threeple of floats and a Fourple of strings. Create a function that has a parameter of a binary function and Coordinate. Apply the function to the Coordinate like List. reduce. Call the function with ( ) for each of the Coordinates in part (b). Call the function with (-) for the numeric Coordinates in part (b). Be sure that your function implements the normal associativity for (-).