Function: mean(invert(2 *(numbers('xyy') if numbers('yxr') > numbers('rep') else numbers('yxr') if numbers('xyy') > numbers('rep') else numbers("xxx"))), 2 *(numbers("xxx") if numbers('xyy') > numbers('rep') else numbers('yxr') if numbers('xyy') > numbers('yxr') else numbers('rep')))
