diff -r b84ea52bfd8f -r cdfb2ce30a3d solutions1/collatz.scala
--- a/solutions1/collatz.scala	Tue Nov 12 10:47:27 2019 +0000
+++ b/solutions1/collatz.scala	Tue Nov 19 00:40:27 2019 +0000
@@ -17,6 +17,9 @@
   all.maxBy(_._1)
 }
 
+//collatz_max(1000000)
+//collatz_max(10000000)
+//collatz_max(100000000)
 
 /* some test cases
 val bnds = List(10, 100, 1000, 10000, 100000, 1000000)