Function: gradient[0](gradient[1](numbers("xxr") if numbers('ryy') > invert(numbers("per")) else numbers("per")) if invert(numbers("per")) > invert(numbers("per")) if numbers("xxr") > numbers('ryy') else numbers("per") else square(gradient[1](numbers("per") if numbers('ryy') > numbers("xxr") else invert(numbers("per")))))
