diff -r e9d14d58be3c -r daf561a83ba6 core_marking3/postfix_test3.scala
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core_marking3/postfix_test3.scala	Mon Apr 11 23:55:27 2022 +0100
@@ -0,0 +1,9 @@
+import C3b._
+
+
+assert(syard(split("3 + 4 * ( 2 - 1 )")) == List("3", "4", "2", "1", "-", "*", "+"))
+assert(syard(split("( ( ( 3 ) ) + ( ( 4 + ( 5 ) ) ) )")) == List("3", "4", "5", "+", "+"))
+assert(syard(split("5 + 7 / 2")) == List("5", "7", "2", "/", "+"))
+assert(syard(split("5 * 7 / 2")) == List("5", "7", "*", "2", "/"))
+assert(syard(split("3 + 4 * 8 / ( 5 - 1 ) ^ 2 ^ 3")) == List("3", "4", "8", "*", "5", "1", "-", "2", "3", "^", "^", "/", "+"))
+