Function: minus(gradient[2](sum(numbers('epe'), numbers("xxr")) if sum(sum(numbers('epe'), numbers("xxr")), numbers('epe')) > numbers('epe') else numbers("xxr") if numbers('epe') > sum(sum(numbers('epe'), numbers("xxr")), numbers('epe')) else sum(numbers('epe'), numbers("xxr"))), numbers('epe') if sum(numbers('epe'), numbers("xxr")) > sum(sum(numbers('epe'), numbers("xxr")), numbers('epe')) else sum(numbers('epe'), numbers("xxr")) if sum(sum(numbers('epe'), numbers("xxr")), numbers('epe')) > numbers("xxr") else numbers('epe'))
