diff -r e48ea8300b2d -r 9471c3b7ea02 core_testing2/docdiff_test1.scala
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core_testing2/docdiff_test1.scala	Mon Nov 08 01:03:09 2021 +0000
@@ -0,0 +1,6 @@
+
+import C2._
+
+assert(clean("ab a abc") == List("ab", "a", "abc"))
+
+assert(clean("ab*a abc1") == List("ab", "a", "abc1"))