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diff --git a/04-13.md b/04-13.md
index 937fe4a..b4ae755 100644
--- a/04-13.md
+++ b/04-13.md
@@ -293,3 +293,7 @@ bool bsearch(int a[], int n, int x){
 Is binary search always better than sequential search?
 Answer: It depends
 - How about if the sequence is not sorted?
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+---
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+[04/15 ->](04-15.md)