--- a/SequenceableCollection.st	Tue Oct 22 20:26:06 2019 +0200
+++ b/SequenceableCollection.st	Tue Oct 22 20:26:38 2019 +0200
@@ -8782,15 +8782,18 @@
 indexOf:anElement startingAt:start step:step
     "search the collection for anElement, starting the search at index start;
      if found, return the index otherwise return 0.
+     Only look at every step element.
      The comparison is done using =
      (i.e. equality test - not identity test)."
 
     |startIndex "{ Class: SmallInteger }"
+     stepCount  "{ Class: SmallInteger }" 
      stop       "{ Class: SmallInteger }" |
 
     startIndex := start.
     stop := self size.
-    startIndex to:stop by:step do:[:index |
+    stepCount := step.
+    startIndex to:stop by:stepCount do:[:index |
         anElement = (self at:index) ifTrue:[^ index].
     ].
     ^ 0
@@ -8798,6 +8801,7 @@
     "
      args:    anElement : <object>
               start     : <integer>
+              step     : <integer>
 
      returns: elementIndex - if found
               0            - if not found
@@ -8809,6 +8813,7 @@
     "
 
     "Created: / 18-09-2018 / 14:06:32 / Stefan Vogel"
+    "Modified (comment): / 22-10-2019 / 19:57:19 / Stefan Vogel"
 !
 
 indexOfAny:aCollection