--- a/Collection.st	Mon Jul 17 17:17:33 2017 +0200
+++ b/Collection.st	Mon Jul 17 17:24:13 2017 +0200
@@ -750,16 +750,6 @@
     "Modified (comment): / 13-02-2017 / 19:58:28 / cg"
 !
 
-firstValue
-    "return the first value in the collection.
-     Normally the same as #first, but some collections prefer to return
-     an association from #first; there it is redefined"
-
-    ^ self first
-
-    "Created: / 17-07-2017 / 17:17:04 / cg"
-!
-
 fourth
     "return the fourth element of the collection.
      For unordered collections, this simply returns the fourth
@@ -888,16 +878,6 @@
     "Created: 6.2.1996 / 15:27:49 / cg"
 !
 
-lastValue
-    "return the last value in the collection.
-     Normally the same as #last, but some collections prefer to return
-     an association from #last; there it is redefined"
-
-    ^ self last
-
-    "Created: / 17-07-2017 / 17:16:44 / cg"
-!
-
 nth:n
     "return the nth element of the collection.
      For unordered collections, this simply returns the nth