Steps to reinstall Lion and do secure erase

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i'm thinking selling 2010 macbook air in next few days before wwdc. came snow leopard upgraded lion through app store. i'm not entirely new mac , know how basic stuff, guys me reinstalling lion (i don't need install snow leopard again, i?) , securely erasing ssd before putting sale. don't need detailed description, step step guide or how in right order.
 

i've never done before either i'm doing right is:

boot mac , hold option button while it's starting up. pick lion recovery think called , follow steps. i'm not sure if erases find out in 14mins when lion done downloading , when it's done installing it.

edit: should erase ssd using disk utility in main menu when boot while holding option button.
 


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