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<?php
//Force the read more link on an excerpt regardless of the excerpt length

//Read More Button For Excerpt
function themprefix_excerpt_read_more_link($output) {
	global $post;
	return $output . ' <a href="' . get_permalink($post->ID) . '" class="more-link" title="Read More">Read More</a>';
}
add_filter( 'the_excerpt', 'themprefix_excerpt_read_more_link' );