ORCHARD PARK, N.Y. (AP) - Emphasizing surprise and versatility, Buffalo Bills first-year defensive coordinator Mike Pettine is unveiling a new scheme designed to keep opponents guessing.
If that leads to some Bills initially experiencing difficulty identifying what position they're playing, Pettine's fine with that, too.
```I don't know,''' he says, smiling, ``is a good answer.''
Pettine is responding to comments made by several Buffalo veterans in sharing their first impressions of a defense geared toward creating mismatches by having players learn multiple roles. Three weeks into spring minicamps, the question becomes how quickly the Bills can adapt to yet another new system - their third in three years.
Pettine's part of coach Doug Marrone's new staff after spending the past four years holding the same job with the New York Jets.

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