From 338ee35832098e76eda37350a9c4bf8801bd334f Mon Sep 17 00:00:00 2001
From: Matthias Bilger <matthias@bilger.info>
Date: Mon, 21 Dec 2020 07:15:28 +0100
Subject: [PATCH] fixed p2

---
 day21/module.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/day21/module.py b/day21/module.py
index 916f8e4..47a812c 100644
--- a/day21/module.py
+++ b/day21/module.py
@@ -58,6 +58,8 @@ def p2(hazzard):
                         hazzard2[i] = list(v.intersection(hazzard2[i]))
                     else:
                         hazzard2[i] = list(v)
+            if i not in hazzard2:
+                hazzard2[i] = hazzard[i]
         hazzard = hazzard2
     print(','.join([x[0] for x in sorted(hazzard.items(), key=lambda x: x[1])]))