The following headers are meant as a guide to the sections that you need in your module:
Give a short introduction to your topic to put it in context
This is where you put the core text of your module.
You can delete the header for this section and place your own related to the topic
Link to external web pages, for example wikipedia or youtube
You need at least two different sources here. Websites are not allowed
Link to outside sources. Wikipedia entried should probably be referenced here.
Make up some practice problems for the future readers.
If you want future readers to know that you worked on this module (not required)
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