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Notes/01_Introduction/01_Python.md

@@ -181,5 +181,5 @@ exercise work. For example:
 >>>
 ```
 
-\[ [Contents](../Contents) \] \| \[ [Next (1.2 Hello World)](02_Hello_world) \]
+[Contents](../Contents) \| [Next (1.2 A First Program)](02_Hello_world)
 

Notes/01_Introduction/03_Numbers.md

@@ -228,4 +228,4 @@ Months 309
 
 While you’re at it, fix the program to correct the for overpayment that occurs in the last month.
 
-[Next](04_Strings)
+[Contents](../Contents) \| [Previous (1.2 A First Program)](02_Hello_world) \| [Next (1.4 Strings)](04_Strings)

Notes/01_Introduction/04_Strings.md

@@ -422,4 +422,4 @@ For example, a popular alternative to Python's normal interactive mode
 is IPython (http://ipython.org).  IPython provides some nice features
 such as tab-completion of method names, more integrated help and more.
 
-[Next](05_Lists)
+[Contents](../Contents) \| [Previous (1.3 Numbers)](03_Numbers) \| [Next (1.5 Lists)](05_Lists)

Notes/01_Introduction/05_Lists.md

@@ -401,4 +401,4 @@ example, a list that consists entirely of numbers or a list of text
 strings.  Mixing different kinds of data together in the same list is
 often a good way to make your head explode so it's best avoided.
 
-[Next](06_Files)
+[Contents](../Contents) \| [Previous (1.4 Strings)](04_Strings) \| [Next (1.6 Files)](06_Files)

Notes/01_Introduction/06_Files.md

@@ -214,4 +214,4 @@ Try it:
 >>>
 ```
 
-[Next](07_Functions)
+[Contents](../Contents) \| [Previous (1.5 Lists)](05_Lists) \| [Next (1.7 Functions)](07_Functions)

Notes/01_Introduction/07_Functions.md

@@ -255,3 +255,5 @@ bash % python3 pcost.py Data/portfolio.csv
 Total cost: 44671.15
 bash %
 ```
+
+[Contents](../Contents) \| [Previous (1.6 Files)](06_Files) \| [Next (2.0 Working with Data)](../02_Working_with_data/00_Overview)