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David Seelig/Associated Press

The San Francisco 49ers have addressed three key needs so far this offseason:

1. Cornerback. Last year’s starting corners—Chris Culliver and Perrish Cox—signed with the Washington Redskins and the Tennessee Titans respectively. To replace them, the 49ers signed Chris Cook and Shareece Wright. Wright probably will start opposite Tramaine Brock, the 49ers’ best cornerback. Brock suffered a turf-toe injury Week 1 last season and never fully recovered. If Brock is healthy, he and Wright could be a better tandem than Culliver and Cox.

2. Scatback. The 49ers didn’t have any scatbacks most of last season. Kendall Hunter tore his ACL during training camp, and San Francisco cut LaMichael James after Week 1. Without those two, the 49ers didn’t have a running back with speed. The Niners fixed that problem this offseason when they signed Reggie Bush. Even though he’s 30, he still should be an effective scatback—someone who runs to the outside and catches passes. If Bush’s 30-year-old body happens to break down, Hunter should be healthy and ready to take his place.

3. Deep-threat wide receiver. Brandon Lloyd was the Niners’ only deep threat last season. He’s a free agent now. The Niners don’t seem to have any interest in him, and neither do any other teams. He turns 34 in July. The 49ers replaced him this offseason with two deep threats in their 20s—Torrey Smith (26) and Jerome Simpson (29).

Counting those additions to the roster, the 49ers still must address the following five needs.