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<?php
			
				$args = array(
					'posts_per_page'   => 1,
					'offset'           => 0,
					'category'         => '21',
					'orderby'          => 'post_date',
					'order'            => 'DESC',
					'include'          => '',
					'exclude'          => '',
					'meta_key'         => '',
					'meta_value'       => '',
					'post_type'        => 'post',
					'post_mime_type'   => '',
					'post_parent'      => '',
					'post_status'      => 'publish',
					'suppress_filters' => true );
				
				$posts_array = get_posts( $args );
				
				foreach ( $posts_array as $post ) : setup_postdata( $post ); ?>
					<li>
						<a href="<?php the_permalink(); ?>"><?php the_title(); ?></a>
					</li>
			
			<?php 
				endforeach; 
				wp_reset_postdata();
			?>