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Navigation Part
The navigation part is composed of buttons which can be inactive or active:
Inactive
buttons are present in the page to preserve an homogeneous structure, but
also to give information about the existence of a preceding, next or upper
page. They are the following:
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Active
buttons lead to another page. They are the following:
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back button | up button | next button | |
link to: | the previous page | the head of the chapter | the following page |