diff --git a/python_experiments/depth_first_search/depth_first_search.py b/python_experiments/depth_first_search/depth_first_search.py
index d6804ae..a3d7587 100755
--- a/python_experiments/depth_first_search/depth_first_search.py
+++ b/python_experiments/depth_first_search/depth_first_search.py
@@ -21,11 +21,15 @@ def main():
     activity_tree.activities[9] = Activity(id=9, parent=8, text="I")
     activity_tree.activities[10] = Activity(id=10, parent=9, text="J")
 
-    match_iter = MatchIter(activity_tree, lambda act: act.id in (2, 5, 10))
+    match_iter = MatchIter(
+        activity_tree,
+        lambda act: act.id in (2, 5, 10),
+        lambda act: act.id in (4,),
+    )
 
     while (depth_and_node := match_iter.get_next()) is not None:
-        depth, matched, node = depth_and_node
-        print("\t".join((str(depth), str(matched), node.text)))
+        depth, matched, transparent, node = depth_and_node
+        print("\t".join((str(depth), str(matched), str(transparent), node.text)))
 
     # while True:
     #     print("\n\n\nvvvvvvvvvv\n\n")
@@ -56,21 +60,27 @@ class MatchIter:
     activity_tree: ActivityTree
     stack: deque[StackEntry]
     is_match: Callable[[Activity], bool]
+    is_transparent: Callable[[Activity], bool]
 
     def __init__(
-        self, activity_tree: ActivityTree, is_match: Callable[[Activity], bool]
+        self,
+        activity_tree: ActivityTree,
+        is_match: Callable[[Activity], bool],
+        is_transparent: Callable[[Activity], bool],
     ) -> None:
         self.activity_tree = activity_tree
         self.stack = deque([StackEntry(0)])
         self.is_match = is_match
+        self.is_transparent = is_transparent
 
-    def get_next(self) -> tuple[int, bool, Activity] | None:
+    def get_next(self) -> tuple[int, bool, bool, Activity] | None:
         if (next_announce := self.get_next_announce()) is not None:
             next_announce_depth, next_announce_entry = next_announce
             next_announce_entry.announced = True
             return (
                 next_announce_depth,
                 next_announce_entry.matched,
+                next_announce_entry.transparent,
                 self.activity_tree.activities[next_announce_entry.node_id],
             )
 
@@ -91,6 +101,7 @@ class MatchIter:
                         parent.should_announce = True
 
             stack_entry.visited = True
+            stack_entry.transparent = self.is_transparent(node)
 
             children = [
                 c for c in self.activity_tree.activities.values() if c.parent == node.id
@@ -109,6 +120,7 @@ class MatchIter:
                 return (
                     next_announce_depth,
                     next_announce_entry.matched,
+                    next_announce_entry.transparent,
                     self.activity_tree.activities[next_announce_entry.node_id],
                 )
 
@@ -121,7 +133,13 @@ class MatchIter:
     def get_next_announce(self) -> tuple[int, StackEntry] | None:
         for entry in self.stack:
             if entry.should_announce and not entry.announced:
-                depth = len(list(self.walk_up_stack(entry)))
+                depth = len(
+                    list(
+                        entry
+                        for entry in self.walk_up_stack(entry)
+                        if not entry.transparent
+                    )
+                )
 
                 return (depth, entry)
         return None
@@ -146,10 +164,11 @@ class StackEntry:
     should_announce: bool = False
     visited: bool = False
     matched: bool = False
+    transparent: bool = False
 
     def text(self, activity_tree: ActivityTree) -> str:
         node = activity_tree.activities[self.node_id]
-        return f"{node.text}\t{"annced" if self.announced else "-"}\t{"should" if self.should_announce else "-"}\t{"visited" if self.visited else "-"}\t{"matched" if self.matched else "-"}"
+        return f"{node.text}\t{"annced" if self.announced else "-"}\t{"should" if self.should_announce else "-"}\t{"visited" if self.visited else "-"}\t{"matched" if self.matched else "-"}\t{"trans" if self.transparent else "-"}"
 
 
 if __name__ == "__main__":