I'm trying to create a macro to list descendants of a particular document type no matter where they are in the content tree. At the moment it only traverses through the first list (in this instance the UG study list) but I need it to travel both lists:

-Main
---UG study (programmeList)
......programme 1
......programme 2
---PG study (programmeList)
......programme 1
......programme 2

How do I get it to get any document types not just from the first list?

@using umbraco.MacroEngines
@inherits DynamicNodeContext
@{
    string schoolToFind = Parameter.ProgrammeSchool;
    var root = Model.AncestorOrSelf();
    var programmeNames = root.Descendants("ProgrammeList").First();
        
       <div>
        @foreach (var item in programmeNames.Children.OrderBy("programmeName"))
        {
             string[] school = item.school.ToString().Split(',');
            
            if (school.Contains(schoolToFind))
                {
                    <li>
                    <a href="@item.Url">@item.programmeName - @item.qualificationType</a> 
                    </li>
                    }
            
                         }
    </div>
            
}