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The Cumbrians lost 2-1 at Sheffield Wednesday at the weekend, going down to Michail Antonio's winner in the fifth minute of time added on, and now lie three points adrift of sixth-placed Stevenage with two games remaining.
"I really thought we were going to hang on and pick up a valuable point from the game, but that late goal was a real sickener for us," Berrett told the club's official website.
"We're all feeling a bit deflated by the result, but we need to pick ourselves up and get our minds on to next weekend's game against Exeter City as we've still got a chance of making the play-offs.
"If we can get maximum points from our next two games then we'll have done all we can and will have to hope that other teams do us a favour elsewhere."
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