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That sucks. It's always unfathomably frustrating when I fuck up something that I'm usually perfectly capable of doing, and it always puts me in a real deep funk. If it makes you feel any better, it happens to everyone.It'll feel better when you nail it this weekend.
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This, in essence. "You're only human"; we're fallible and fuck up sometimes. Just don't let it get you down, because you know you're capable of passing it.