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<?php
// Do NOT include the opening php tag

add_filter( 'genesis_pre_load_favicon', 'child_favicon_filter' );
/**
 * Change the location of the favicon reference.
 *
 * @author Greg Rickaby
 * @since 1.0.0
 */
function child_favicon_filter( $favicon_url ) {

	return 'http://cdn.yoursite.com/wp-content/themes/child/images/favicon.ico';

}