diff -r 40657f9a4e4a -r 663c2a9108d1 testing4/postfix_test9.scala
--- a/testing4/postfix_test9.scala	Sat Oct 31 16:47:46 2020 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,21 +0,0 @@
-import CW9b._
-
-
-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", "^", "^", "/", "+"))
-
-
-
-assert(compute(syard(split("3 + 4 * ( 2 - 1 )"))) == 7)
-assert(compute(syard(split("10 + 12 * 33"))) == 406)
-assert(compute(syard(split("( 5 + 7 ) * 2"))) == 24)
-assert(compute(syard(split("5 + 7 / 2"))) == 8)
-assert(compute(syard(split("5 * 7 / 2"))) == 17)
-assert(compute(syard(split("9 + 24 / ( 7 - 3 )"))) == 15)
-assert(compute(syard(split("4 ^ 3 ^ 2"))) == 262144)
-assert(compute(syard(split("4 ^ ( 3 ^ 2 )"))) == 262144)
-assert(compute(syard(split("( 4 ^ 3 ) ^ 2"))) == 4096)
-assert(compute(syard(split("( 3 + 1 ) ^ 2 ^ 3"))) == 65536)