let
  type rec = { key : string, value : int }
  var rec1 : rec := nil
  var rec2 : rec := nil
in
  if (rec1 < rec2) then
    print("lower");

  if (rec1 <= rec2) then
    print("lower or equal");

  if (rec1 = rec2) then
    print("equal");

  if (rec1 >= rec2) then
    print("higher or equal");

  if (rec1 > rec2) then
    print("higher")
end