USA TODAY Sports’ Ralphie Aversa breaks down some much anticipated NFL matchups. USA TODAY

GREEN BAY, Wis. – It was the type of game that could shake a coach to his core. Use any superlative you’d like: The Green Bay Packers run defense was befuddled, annihilated, flat-out embarrassed in San Francisco.

That it happened on such a large stage – 60 minutes from the Super Bowl – only amplified the problems. Four months later, speaking publicly for the first time since his defense was devastated in the NFC championship game, coordinator Mike Pettine’s frustration Friday was still apparent.

“I can’t use any other phrase,” Pettine said, “other than beyond disappointing. It’s tough to realize that we

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