diff --git a/fb_detr/predictor.py b/fb_detr/predictor.py
index 26ab476..a217278 100644
--- a/fb_detr/predictor.py
+++ b/fb_detr/predictor.py
@@ -65,7 +65,7 @@ class Predictor:
 
     @staticmethod
     def __format_probas(probas):
-        return probas.max( axis=1).tolist()
+        return probas.max(axis=1).tolist()
 
     def __format_prediction(self, predictions: dict):
 
@@ -91,7 +91,7 @@ class Predictor:
         if boxes:
             keep = map(lambda c: c != self.rejection_class, classes)
             compressed = list(compress(zip(boxes, classes, probas), keep))
-            boxes, classes, probas = map(list, zip(*compressed)) if compressed else ([], [])
+            boxes, classes, probas = map(list, zip(*compressed)) if compressed else ([], [], [])
             predictions["bboxes"] = boxes
             predictions["classes"] = classes
             predictions["probas"] = probas
diff --git a/fb_detr/utils/box_merging.py b/fb_detr/utils/box_merging.py
index 54c86d2..7a10d3c 100644
--- a/fb_detr/utils/box_merging.py
+++ b/fb_detr/utils/box_merging.py
@@ -96,20 +96,26 @@ def keep(a, b, iou_thresh):
 def filter_contained(lpboxes, iou_thresh=.1):
 
     current_boxes = {*lpboxes}
+    remaining = set()
 
     while True:
+        print()
         print("current_boxes", len(current_boxes))
-        remaining = set()
         for a, b in combinations(current_boxes, r=2):
-            print()
             for keeping in filter(truth, keep(a, b, iou_thresh=iou_thresh)):
                 remaining.add(keeping)
+                try:
+                    current_boxes.remove(keeping)
+                except:
+                    pass
+                break
 
         print("remaining", len(remaining))
         if len(remaining) == len(current_boxes):
             break
 
         current_boxes = {*remaining}
+        remaining = set()
 
     return remaining
 
diff --git a/incl/detr b/incl/detr
index 7e3258c..c17cddd 160000
--- a/incl/detr
+++ b/incl/detr
@@ -1 +1 @@
-Subproject commit 7e3258ccc1fa2be7a9d8ab333873b79de7005809
+Subproject commit c17cddd980ae3003a2633a65744d2265228e4c71
diff --git a/requirements.txt b/requirements.txt
index 7d4c102..250550b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,3 +12,4 @@ requests==2.27.1
 iteration-utilities==0.11.0
 dvc==2.9.3
 dvc[ssh]
+frozendict==2.3.0