How to erase Macbook Air without disc or cd

I am trying to erase my macbook air and i dont know how.

I do not like to retype ...
https://discussions.apple.com/message/20747273#20747273

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    Download CS3 products
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    Yes, sign in with the same Apple ID as your stolen one in the new iPod Touch.

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    Genius Bar reservation
    http://www.apple.com/retail/geniusbar/
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    Disk Map
    https://itunes.apple.com/us/app/disk-map/id715464874?mt=12
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    http://pondini.org/TM/30.html
    and here:
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    see here:
    Your Solid State Drive and having enough space inside your Macbook Air & Pro
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    A Professional Example
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    Slim USB3 1TB external hard drive
    External Hard Drives
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    2. Redundancy for important data.
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    External hard drives are a foregone necessity for purchase with any Macbook for at the very least Time Machine backups, data redundancies, and ideally for large media storage.

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