--- a/Collection.st	Thu Jun 07 17:16:20 2018 +0200
+++ b/Collection.st	Thu Jun 07 20:29:37 2018 +0200
@@ -1,5 +1,3 @@
-"{ Encoding: utf8 }"
-
 "
  COPYRIGHT (c) 1989 by Claus Gittinger
               All Rights Reserved
@@ -297,6 +295,8 @@
     ^ self newWithSize:n
 ! !
 
+
+
 !Collection class methodsFor:'Signal constants'!
 
 emptyCollectionSignal
@@ -356,14 +356,6 @@
      Abstract subclasses must redefine this again."
 
     ^ self == Collection
-!
-
-mutableClass
-    "Return a version of me with mutable instances.
-     Only redefined in the immutable collections (of which instances are
-     created by the compiler)"
-
-    ^ self
 ! !
 
 !Collection methodsFor:'Compatibility-ANSI'!
@@ -375,6 +367,7 @@
     ^ self includesIdentical:anObject.
 ! !
 
+
 !Collection methodsFor:'Compatibility-Squeak'!
 
 , aCollection
@@ -535,6 +528,7 @@
     ^ self ifEmpty:ifEmptyValue ifNotEmpty:ifNotEmptyValue
 ! !
 
+
 !Collection methodsFor:'accessing'!
 
 anElement
@@ -4617,7 +4611,7 @@
     aStream nextPut:$)
 
     "
-     #(1 2 3 'hello' $a $ü) printOn:Transcript
+     #(1 2 3 'hello' $a $ü) printOn:Transcript
      (Array new:100000) printOn:Transcript
      (Array new:100000) printOn:Stdout
      (Array new:100000) printString size
@@ -5976,7 +5970,7 @@
 includesAll:aCollection
     "return true if the receiver includes all elements of
      the argument, aCollection; false if any is missing.
-     Notice: this method has O² runtime behavior and may be
+     Notice: this method has O² runtime behavior and may be
              slow for big receivers/args.
              Think about using a Set, or Dictionary."
 
@@ -5996,7 +5990,7 @@
      Return false if it includes none.
      Uses #= (value compare)
      Notice:
-        this method has O² runtime behavior for some subclasses and may be slow for big receivers/args.
+        this method has O² runtime behavior for some subclasses and may be slow for big receivers/args.
         Think about using a Set or Dictionary.
         Some speedup is also possible, by arranging highly
         probable elements towards the beginning of aCollection, to avoid useless searches.
@@ -6073,7 +6067,7 @@
      Return false if it includes none.
      Use identity compare for comparing.
      Notice:
-        this method has O² runtime behavior for some subclasses and may be slow for big receivers/args.
+        this method has O² runtime behavior for some subclasses and may be slow for big receivers/args.
         Think about using a Set or Dictionary.
         Some speedup is also possible, by arranging highly
         probable elements towards the beginning of aCollection, to avoid useless searches."
@@ -6289,6 +6283,7 @@
     ^ aVisitor visitCollection:self with:aParameter
 ! !
 
+
 !Collection class methodsFor:'documentation'!
 
 version