It’s okay… it happens.  You can’t retrieve it, but you can reset it using PowerShell.  Make sure that the account you are logged in as is: (1) a farm admin and (2) local admin on server

 

$passphrase = ConvertTo-SecureString -asPlainText –Force

Set-SPPassPhrase -PassPhrase $passphrase –Confirm

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More info on TechNet: http://technet.microsoft.com/en-us/library/ff607568.aspx