diff --git a/live/solutions/operatoren.groovy b/live/solutions/operatoren.groovy
index 87f5353..f9eb483 100644
--- a/live/solutions/operatoren.groovy
+++ b/live/solutions/operatoren.groovy
@@ -1,4 +1,6 @@
 def words = ["Groovy", "ist", "cool"]
+def numbers = [1, 2, 3, 4, 5]
+
 def lengths = words*.length()
 def squares = numbers*.multiply(numbers)