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Walker continues to practice at LT

Tre Madden's staying at running back for the long haul, but Lane Kiffin's other week-long experiment he thought up over the Trojans' Spring Break also appears to be continuing.

Sophomore Aundrey Walker practiced at left tackle again on Tuesday, the fourth straight practice the 6-6, 320-pounder has lined up on the left side since he worked the first three sessions as a right tackle. Previously, Kiffin had said he'd be evaluated after one week there, so he clearly passed at least USC's initial test in staying there Tuesday.

Fourth-year junior Kevin Graf stayed on the right. Walker, looking like an increasingly likely proposition as USC's 2012 left tackle, said he's ambivalent to which side he plays, although he did allow that there is a certain amount of prestige that comes with being the left tackle.

"It's the blind side," he said Tuesday. "I'm protecting Matt Barkley's blind side. It's an honor."

The interesting thing is that both Walker and Graf have appeared more comfortable on the left side.

Graf started well in the first week of spring practice while playing left tackle but has had his play fall off a bit since transitioning to the right. Walker started off fine but has upped his play some since moving over.

At this point, both are for-sure starters, it's just not clear where. It looks like the two could keep switching intermittently until a specific starter is found. Graf played last season at right tackle, so he clearly has experience there, and Walker is the left tackle of the future, so there's a reason to have him there too.

But the mammoth tackle -- who's lost upwards of 50 pounds over the last year -- insists which side he plays doesn't matter.

"I'm just trying to help the team, basically," Walker said. "If I'm good at left tackle or if I'm good at right then I'll play there."