fix typo

Akuli · Akuli · commit 81f7a0f81081 · 2016-08-11T14:30:43.000+03:00
diff --git a/lists.md b/lists.md
@@ -44,7 +44,7 @@ for thing in things:
 
 [Read more about lists in ThinkPython
 here.](http://greenteapress.com/thinkpython2/html/thinkpython2011.html)
-Skip the chapter "10.7 Map, filter and reduce", and all excercises. You
+Skip the chapter "10.7 Map, filter and reduce", and all exercises. You
 would need to know how to define functions using the `def` keyword, but
 we haven't talked about that yet.
 
diff --git a/the-way-of-the-program.md b/the-way-of-the-program.md
@@ -6,7 +6,7 @@ here.](http://greenteapress.com/thinkpython2/html/thinkpython2002.html).
 
 Read the glossary also, but don't study it too much. Some things in it
 are useful to know, but I think studying it carefully would be really
-boring. Also do all excercises except the last one. It's more about
+boring. Also do all exercises except the last one. It's more about
 math skills than learning Python.
 
 When you're done reading, read the summary below and make sure you've
@@ -27,7 +27,7 @@ learned everything.
         doesn't matter if you use 'single quotes' or "double quotes",
         they do the same thing in Python.
 
-## More excercises
+## More exercises
 
 1. What happens if you use + between two strings, like
     `"hello" + "world"`?
diff --git a/todo.md b/todo.md
@@ -1,4 +1,4 @@
 - Lists and tuples
 - Loops (maybe move while loops here?)
 - Defining functions
-- More excercises!
+- More exercises!
