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Messages on rubber bracelets explain 49ers defense. Among them: 'Take it Personal' and 'Extreme Violence'.

MIAMI — Robert Saleh slowly rotated the two rubber bracelets on his right wrist, and over the next several minutes, offered a window into his soul and the heartbeat of his players.

At a near-empty table inside a South Florida hotel ballroom this week, the San Francisco 49ers’ defensive coordinator took his time unveiling the secret behind the league’s most disruptive, destructive and dominant force this season.

“A.G.N.B.”

“A.A.”

“E.V.”

The acronyms tell the story of a talented unit that was challenged to be the best version of itself by its head coach, Kyle Shanahan.