diff --git a/app/src/main/java/de/uni_marburg/powersort/FinnSort/FinnSort.java b/app/src/main/java/de/uni_marburg/powersort/FinnSort/FinnSort.java
index 657e532..598a44c 100644
--- a/app/src/main/java/de/uni_marburg/powersort/FinnSort/FinnSort.java
+++ b/app/src/main/java/de/uni_marburg/powersort/FinnSort/FinnSort.java
@@ -66,6 +66,25 @@ public class FinnSort {
         //printList(a, c);
     }
 
+    private static <T> void merge(T[] a, Run r1, Run r2, Comparator<? super T> c) {
+        T[] left = java.util.Arrays.copyOfRange(a, r1.start, r1.end);
+        int l = 0;
+        int r = r2.start;
+        int k = r1.start;
+
+        while (l < left.length && r < r2.end) {
+            if (c.compare(left[l], a[r]) <= 0) {
+                a[k++] = left[l++];
+            } else {
+                a[k++] = a[r++];
+            }
+        }
+
+        while (l < left.length) {
+            a[k++] = left[l++];
+        }
+    }
+
     private static <T> int extendRunRight(T[] a, int i, Comparator<? super T> c) {
         if (i >= a.length - 1)
             return i + 1;