--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core_marking2/docdiff_test2.scala	Mon Apr 11 23:55:27 2022 +0100
@@ -0,0 +1,10 @@
+
+import C2._
+
+assert(occurrences(List("a", "b", "b", "c", "d")) == Map("a" -> 1, "b" -> 2, "c" -> 1, "d" -> 1))
+
+assert(occurrences(List("d", "b", "d", "b", "d")) == Map("d" -> 3, "b" -> 2))
+
+assert(occurrences(List("b", "b", "b", "b", "b")) == Map("b" -> 5))
+
+assert(occurrences(Nil) == Map())