A 49ers' loss to Seattle would be most shocking exit in 35 years
NFL: San Francisco 49ers beat Seattle Seahawks 21-13 to seal NFC
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49ers clinch NFC West with 21-13 win over Seahawks
Reeling Seahawks have to regroup to keep playoff hopes alive
Purdy, 49ers topple Seahawks 21-13 to win NFC West
49ers are first team to secure division title this season
Seahawks lose fourth in last five games as 49ers win 21-13