Adds separate and unite diagrams to tidy.Rmd

tidy.Rmd

@@ -333,7 +333,7 @@ You may have noticed that we skipped `table3` in the last section. `table3` is u
 
 `separate()` turns a single character column into multiple columns by splitting the values of the column wherever a separator character appears.
 
-[SEPARATE DIAGRAM] ![](images/blank.png)
+![](images/tidy-17.png)
 
 So, for example, we can use `separate()` to tidy `table3`, which combines values of *cases* and *population* in the same column.
 
@@ -371,7 +371,7 @@ You can further customize `separate()` with the `remove`, `convert`, and `extra`
 
 `unite()` does the opposite of `separate()`: it combines multiple columns into a single column.
 
-**TODO: UNITE DESCRIPTION**
+![](images/tidy-18.png)
 
 We can use `unite()` to rejoin the *century* and *year* columns that we created in the last example. That data is saved as `tidyr::table6`.