--- a/progs/lecture2.scala	Wed Dec 21 03:06:18 2016 +0000
+++ b/progs/lecture2.scala	Wed Jan 11 12:18:34 2017 +0000
@@ -348,6 +348,8 @@
 // a student showed me...
 import scala.collection.mutable.ListBuffer
 
+
+
 def collatz_max(bnd: Long): (Long, Long) = {
   val colNos = ListBuffer[(Long, Long)]()
   for (i <- (1L to bnd).toList) colNos += ((collatz(i), i))