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- function get_document_preview($course_info, $lp_id = false, $target = '', $session_id = 0, $add_move_button = false, $filter_by_folder = null, $overwrite_url = null) {
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+ static function get_document_preview($course_info, $lp_id = false, $target = '', $session_id = 0, $add_move_button = false, $filter_by_folder = null, $overwrite_url = null) {
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