diff --git a/readme16-18.md b/readme16-18.md
new file mode 100644
index 0000000..e69de29
diff --git a/readme4-6.md b/readme4-6.md
index 5e82f63..9bd278d 100644
--- a/readme4-6.md
+++ b/readme4-6.md
@@ -1136,4 +1136,4 @@ It is not possible to remove a single item in a tuple but it is possible to dele
   nordic_countries = ('Denmark', 'Finland','Iceland', 'Norway', 'Sweden')
   ```
 
-[<< Part 1](https://github.com/Asabeneh/30-Days-Of-Python/blob/master/readme.md) | [Part 2 >>](https://github.com/Asabeneh/30-Days-Of-Python/blob/master/readme7-9.md)
\ No newline at end of file
+[<< Part 1](https://github.com/Asabeneh/30-Days-Of-Python/blob/master/readme.md) | [Part 3>>](https://github.com/Asabeneh/30-Days-Of-Python/blob/master/readme7-9.md)
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