Function: minus(gradient[2](mod(numbers('yyx'), numbers('yxr')) if numbers('yxr') > numbers('yyx') else sum(mod(numbers('yyx'), numbers('yxr')), numbers('yyx')) if mod(numbers('yyx'), numbers('yxr')) > sum(mod(numbers('yyx'), numbers('yxr')), numbers('yyx')) else numbers('yyx')), mod(numbers('yyx'), numbers('yxr')) if numbers('yyx') > sum(mod(numbers('yyx'), numbers('yxr')), numbers('yyx')) else numbers('yxr') if sum(mod(numbers('yyx'), numbers('yxr')), numbers('yyx')) > mod(numbers('yyx'), numbers('yxr')) else numbers('yyx'))
