diff --git a/day19.py b/day19.py
index d363f18..edb4e69 100644
--- a/day19.py
+++ b/day19.py
@@ -4,7 +4,6 @@ DAY = 19
 TEST_SOLUTION_PART1 = 3
 TEST_SOLUTION_PART2 = 12
 rule_dict = {}
-valid_message_cache = {}
 
 
 def populate_rule_dict(raw_input):
@@ -70,6 +69,8 @@ def part2(test_mode=False):
 
     len_8 = len(valid_messages_42[0])
     len_31 = len(valid_messages_31[0])
+    valid_messages_42 = set(valid_messages_42)
+    valid_messages_31 = set(valid_messages_31)
 
     # rule 0 == 8 11
     # rule 8 == 42 | 42 8 (so just a multiple of 42)