Function: minus(product(numbers("yxx"), numbers('xyy')) if numbers("yxx") > gradient[2](product(numbers("yxx"), numbers('xyy'))) else sum(gradient[2](product(numbers("yxx"), numbers('xyy'))), product(numbers("yxx"), numbers('xyy'))), sum(gradient[2](product(numbers("yxx"), numbers('xyy'))), product(numbers("yxx"), numbers('xyy'))))
