videolink

docs/assignments/week15.md

@@ -313,3 +313,6 @@ Processing website[examples](https://processing.org/examples/graphing2dequation.
 
 And you can see the results here in action:
 
+
+<iframe width="560" height="315" src=../../images/imagW15/step.mp4 frameborder="0" allowfullscreen></iframe>  
+ 
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