diff --git a/OCaml/hw1/python_hint.py b/OCaml/hw1/python_hint.py
index e47d593..f019a67 100644
--- a/OCaml/hw1/python_hint.py
+++ b/OCaml/hw1/python_hint.py
@@ -127,12 +127,17 @@ def __eq__(self, other):
     (symbol('N', 'Num'), [symbol('T', "9")])]
 
 sample_grammar = (symbol('N', 'Expr'), sample_rules[2:])
+sample_grammar2 = (symbol('N', 'Lvalue'), sample_rules[2:])
 
 
 def equal_second_elem_sets(a, b):
     return equal_sets(a[1], b[1])
 
 def get_reachable_symbols(params):
+    # use a helper function so that we can call compute_fixed_point with the full grammar each time
+    return get_reachable_symbols_helper(params)
+
+def get_reachable_symbols_helper(params):
     rules, reachable_symbols = params
     if len(rules) == 0:
         return (rules, reachable_symbols)
@@ -167,4 +172,5 @@ def filter_reachable(g):
 
 
 if __name__ == '__main__':
-    print(filter_reachable(sample_grammar))
+    print("Test 1", filter_reachable(sample_grammar))
+    print("Test 2", filter_reachable(sample_grammar2))