diff -r 42d760984496 -r 56732dbefcff progs/lecture4.scala
--- a/progs/lecture4.scala	Fri Nov 30 08:46:02 2018 +0000
+++ b/progs/lecture4.scala	Fri Nov 30 08:56:22 2018 +0000
@@ -8,7 +8,7 @@
 // You do not want to write functions like contains, first, 
 // length and so on for every type of lists.
 
-
+List("one", "two", "three", "four")