EXETER - APRIL 30:  Devon and Cornwall Police to prevent football violence between Exeter City FC and Plymouth Argyle FC at Exeter's St James Park Football ground on April 30, 2011 in Exeter
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EXETER - APRIL 30: Devon and Cornwall Police to prevent football violence between Exeter City FC and Plymouth Argyle FC at Exeter's St James Park Football ground on April 30, 2011 in Exeter