Standard deviation accumulate

rule "fairAssignmentCountPerTeam"
    when
        accumulate(
            $t : Team()
            and accumulate(
                $a : TeamAssignment(team == $t);
                $teamTotal : count($a)
            );
            $total : sum($teamTotal.intValue() * $teamTotal.intValue())
        )
    then
        scoreHolder.addMediumConstraintMatch(kcontext, - (int) (Math.sqrt($total) * 1000.0));
end

// Can we turn this into 1 accumulate?