link to "Data Clumps" added

_learning_hours/refactoring/parallel_change.md

@@ -35,7 +35,7 @@ Reference - Danilo Sato has published [an article](https://martinfowler.com/blik
 ### Concrete: Code Review 
 Ask everyone to take a look at this code: [Bingo Refactoring Kata](https://github.com/sammancoaching/Bingo-Refactoring-Kata). What code smells do they see (regardless of whether they can name them or not)? What would be a better structure? 
 
-You are hoping they will spot that there are data clumps and [Primitive Obsession](/code_smells/primitive_obsession.html) - in particular these primitives: 
+You are hoping they will spot that there are [Data Clumps](/code_smells/data_clumps.html) and [Primitive Obsession](/code_smells/primitive_obsession.html) - in particular these primitives: 
 
     String[][] cells 
     boolean[][] marked 
@@ -59,4 +59,4 @@ While the first parallel change focuses on swapping the internal data structure
 
 
 # Acknowlegements
-This learning hour was first published elsewhere: [Parallel Change](https://github.com/atruvia/samman-coaching-website/blob/lh-additions/_learning_hours/refactoring/parallel-change.md)
+This learning hour was first published elsewhere: [Parallel Change](https://github.com/atruvia/samman-coaching-website/blob/lh-additions/_learning_hours/refactoring/parallel-change.md)