--- a/pre_marking3/postfix_test4.scala	Fri Jan 15 02:47:51 2021 +0000
+++ b/pre_marking3/postfix_test4.scala	Mon Jan 18 22:12:39 2021 +0000
@@ -1,4 +1,4 @@
-import CW9b._
+import CW8b._
 
 
 assert(compute(syard(split("3 + 4 * ( 2 - 1 )"))) == 7)