The website is mainly divided into three sections: 1) Guiding Section; 2) Submenu Section; 3) Content Section and 4) Searching Section
Hotkeys of the website are as follows:

• Alt+U ： upper part of guiding section, where there are the main links of the website.
• Alt+L ：the left part of submenu section, where there are the links to the contents of the units of the website.
• Alt+R ： right part of submenu section, where there are the links to the contents of the units of the website.
• Alt+C ：the middle part of content section, where the contents of the websites are displayed.
• Alt+S ：searching section, where there are the hotkeys of the units.

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