1 files changed, 2 insertions, 10 deletions
diff --git a/monkey/graph.py b/monkey/graph.py
index a8ad4b0..c69d55c 100644
--- a/monkey/graph.py
+++ b/monkey/graph.py
@@ -3,21 +3,13 @@
 class Node(object):
     def __init__(self, data, eout=None):
         self.data = data
-        self.ein = []
         self.eout = eout if eout else []
 
-    # (Re-)insert a child node [target] to [self] at index [idx] (or as the
-    # rightmost child if index is not given). Also append [self] to the list of
-    # parents of [target].
+    # (Re-)insert [target] as the right-most child of [self].
     def add_out(self, target, idx=None):
         if target in self.eout:
             self.eout.remove(target)
-        if idx is None:
-            self.eout.append(target)
-        else:
-            self.eout.insert(idx, target)
-        if self not in target.ein:
-            target.ein.append(self)
+        self.eout.append(target)
         return target
 
     # Return a list of nodes in [self].