local function Thinked()
    local Ents = ents.FindByClass( "durgz_*" )

    if (table.getn(Ents) > 3) then
        for A,B in pairs(Ents) do
            Ents[A] = nil
            for I,E in pairs(Ents) do
                constraint.NoCollide(B,E,0,0)
            end
        end
    end

end

hook.Add("Think", "GameThinking", Thinked)