diff --git a/Python/Dynamic_Programming/grid_traveller.py b/Python/Dynamic_Programming/grid_traveller.py
index 5587f3b..23ab677 100644
--- a/Python/Dynamic_Programming/grid_traveller.py
+++ b/Python/Dynamic_Programming/grid_traveller.py
@@ -19,9 +19,6 @@ def helper(m, n):
         if m == 0 or n == 0:
             return 0
         key = f"{m},{n}"
-        if key in memo:
-            return memo[key]
-        key = f"{n},{m}"
         if key in memo:
             return memo[key]
         memo[key] = helper(m - 1, n) + helper(m, n - 1)