diff -r 59779ce322a6 -r ca48ac1d3c3e marking1/collatz_test1.scala
--- a/marking1/collatz_test1.scala	Sat Jun 22 08:39:52 2019 +0100
+++ b/marking1/collatz_test1.scala	Wed Jul 24 14:22:06 2019 +0100
@@ -1,8 +1,10 @@
 
 
 assert(collatz(1) == 0)
-assert(collatz(6) == 8)
+assert(collatz(6) == 9)
 assert(collatz(9) == 19)
 assert(collatz(9000) == 47)
 
 
+System.exit(4)
+