--- a/progs/lecture4.scala	Mon Nov 30 12:58:37 2020 +0000
+++ b/progs/lecture4.scala	Wed Dec 02 01:15:14 2020 +0000
@@ -249,6 +249,10 @@
 // Source.fromFile(name)(encoding)
 
 
+
+
+
+
 // Sudoku 
 //========