How do I install OS X Lion on my MacBook Pro after wiping it clean, and I don't have the original installation disk I bought?

I'm selling my MacBook Pro (2009) which has Lion installed. After I wipe the computer clean, I assume the system will go back to its factory settings that it came with. I'll need to reinstall Lion, but I don't have the original disk. How do I proceed to reinstall it?

Did the Macbook come with Lion preinstalled or did you upgrade to it?
You need to sell it with the original OS installed, so if that was not Lion, you need to get the install disks by calling Apple and asking for replacement disks (they'll need your serial number).
FWIW, Lion did not come with an install disk - it is download only. If Lion was preinstalled, then post back for instructions on how to do that.

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