diff --git a/2020/Day07.cs b/2020/Day07.cs
index ca2b047..f6d1730 100644
--- a/2020/Day07.cs
+++ b/2020/Day07.cs
@@ -40,10 +40,13 @@ namespace AdventOfCode {
       }
     }
 
-    static int ParseRules(string[] rules) {
+    static List<Contains> ParseRules(string[] rules) {
       var contains = new List<Contains>();
       rules.ToList().ForEach(rule => AddRules(rule, contains));
+      return contains;
+    }
 
+    static int ComputePart1(List<Contains> contains) {
       int setSize = 0;
       var result = new HashSet<string>();
       result.Add("shiny gold");
@@ -62,11 +65,12 @@ namespace AdventOfCode {
     }
 
     static int Part1() {
-      string[] input = File.ReadAllLines(Util.RootDir + "day07.txt");
-      return ParseRules(input);
+      List<Contains> contains = ParseRules(File.ReadAllLines(Util.RootDir + "day07.txt"));
+      return ComputePart1(contains);
     }
 
     static int Part2() {
+      List<Contains> contains = ParseRules(File.ReadAllLines(Util.RootDir + "day07.txt"));
       return -1;
     }
 
@@ -83,7 +87,7 @@ vibrant plum bags contain 5 faded blue bags, 6 dotted black bags.
 faded blue bags contain no other bags.
 dotted black bags contain no other bags.".Split('\n');
 
-      Assert.Equal(4, ParseRules(example));
+      Assert.Equal(4, ComputePart1(ParseRules(example)));
 
       Assert.Equal(213, Part1());
       Assert.Equal(-1, Part2());