First accept the failure. It's never going to be permanent. Understand the cause for failure and work on getting it right next time. Interviews are meant to assess a person to the job at a specific situation and it is by no means to test your capability. As a matter of fact everyone is capable. Let it go, but learn from failures. Pat in your back that you failed this time, but you won't fail the next time! Keep going.. good luck.
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