diff --git a/src/processing.py b/src/processing.py
index d338b31..11b4f41 100644
--- a/src/processing.py
+++ b/src/processing.py
@@ -40,10 +40,10 @@ def explore_solutions(solutions, data):
 
 
 def remove_duplicates(current, previous, data):
-    data = data.query(
+    duplicate_free_df = data.query(
         f"(source != {current} or destination not in @previous) and (source not in @previous or destination != {current})"
     )
-    return data
+    return duplicate_free_df
 
 
 def greedy_algorithm(n, m, data):