Keenan Allen

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Programming note: For complete 49ers coverage, watch SportsNet Central tonight at 6 p.m., 10:30 and midnight on Comcast SportsNet Bay Area

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Editor’s note: This is the second part in a series that spotlights three Raiders-Chargers matchups to watch Sunday, 1:05 p.m., at Qualcomm Stadium.

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Programming note: Watch Yahoo SportsTalk Live tonight at 5 & 11 on Comcast SportsNet Bay Area

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Programming note: For all the day’s sports news, tune in to SportsNet Central tonight at 6 p.m., 10:30 and midnight on Comcast SportsNet Bay Area

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SAN DIEGO -- Keenan Allen really did think about quitting last summer.