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Message: <blockquote data-quote="chas_m" data-source="post: 1636342">Here's what I would do:1. Run Time Machine so that all your stuff is backed up and "up to date."2. Restart the machine and hold down "command" and the R key (command-r). You'll be presented with some options, one of which is "Disk Utility."3. Use Disk Utility to erase the main partition (it won't erase the Recovery partition you're currently booted from. As the name implies, this erases the hard drive completely. Once this is done, quit Disk Utility.4. Now you have the option on installing OS X. Select that, and sign in with your Apple ID/iTunes account login. This will probably offer you only the option of installing Yosemite.5. Once Yosemite is installed, the machine will reboot and act as if you just bought it, running through the usual machine setup routine. At one point, it will ask you if you want to restore your account from Time Machine. Restore your data from Time Machine, or just the Applications if you want to start over with a new account that has none of your old stuff.That should do the trick.</blockquote>

Verification: How many occurrences of a n-u-m-b-e-r between "d" and "f" in this example...(sdgs6ngklu3gd#f9%)?