HT201612 I was trying to install windows using boot amp but now I can't boot my MaOckbook pro again

I was trying to install windows using boot amp but now I can't boot my MacBook  pro again

Go to the Windows Control Panel and select Boot Camp applet. In that applet there is a Boot Drive option. Select Mac OS X.
Or restart the system and hold down the Option key for a few second. A Boot Menu screen will come up. Select Macintosh HD.
Once in OS X go to the Sys Prefences, Startup Disk and select Macintosh HD Mt Lion 10.8.2 and click Restart then Restart again. the system will now restart in Mac OS X.
To boot back to Windows do the same, Startup Disk, and select Windows then Restart and Restart again.

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