Function: square(invert(gradient[0](numbers('xyy') if numbers("yxx") > numbers("yxx") else minus(numbers('xyy'), numbers("yxx"))) if numbers("yxx") if numbers("yxx") > numbers('xyy') else minus(numbers('xyy'), numbers("yxx")) > numbers('xyy') else minus(numbers('xyy'), numbers("yxx"))))
