Corn, soybeans surge by daily limits

* Huge corn and wheat exports supportive * Markets recovering, but wheat on track for weekly loss * Global unrest should keep prices volatile * Coming Up: Will gains hold into next week? (Updates to include limit up moves, fresh analyst quotes, adds details) By Sam Nelson CHICAGO, Feb 25 (Reuters) - U.S. grains surged on Friday in a break from a week-long selloff, sparked by geopolitical

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