Multiple Where clause

[TestMethod]
    public void DynamicQueryCombiningPredicates() {
      //T11526
      var pd1 = new PredicateDescription("UnitPrice", FilterOperator.IsGreaterThanOrEqualTo, 24);
      var pd2 = new PredicateDescription("Discontinued", FilterOperator.IsEqualTo, true);
      var pd3 = new PredicateDescription("Category.Name", FilterOperator.StartsWith, "P");
      var arrPredicates = new ArrayList { pd1, pd2, pd3 };
      
      CompositePredicateDescription compPredicates = null;
      IPredicateDescription predicate = null;

      for (int arrCount = 0; arrCount < arrPredicates.Count; arrCount++) {
        if (predicate != null) {
          if (compPredicates == null) {
            compPredicates = predicate.And((IPredicateDescription)arrPredicates[arrCount]);
            //tried this as well
            //compPredicates = (predicate.And((IPredicateDescription)arrPredicates[arrCount]));
          } else {

            //here is the part where i add the parenthesis, but i tried the above as well...
            compPredicates = (compPredicates).Or((IPredicateDescription)arrPredicates[arrCount]);
          }
        } else {
          predicate = (IPredicateDescription)arrPredicates[arrCount];
        }
      }

      var r1 = _em1.Products.Where(p => (p.UnitPrice >= 24 && p.Discontinued) || p.Category.Name.StartsWith("P")).ToList();
      var r2 = _em1.Products.Where(compPredicates).ToList();
      Assert.IsTrue(r1.Count == r2.Count);
    }

      var pd1 = new PredicateDescription("AccountID", FilterOperator.IsEqualTo, "123");
      var pd2 = new PredicateDescription("Group", FilterOperator.IsEqualTo, "Group1");
      var pd3 = new PredicateDescription("AccountID ", FilterOperator.IsEqualTo, "1234");
      
      var pd = (pd1.And(pd2)).Or(pd3);