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diff --git a/13.md b/13.md
index 7c9cdf9..49dd7e3 100644
--- a/13.md
+++ b/13.md
@@ -98,3 +98,7 @@
 	- Like taking a picture and the subject moves
 
 ![diagram](13.10.png)
+
+---
+
+[Sequential design using flip-flops ->](14.md)