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// Add Login/Logout shortcode
function xmit_login_logout() {
	if (is_user_logged_in()) :?>
	    <a href="<?php echo wp_logout_url(get_permalink()); ?>">Logout</a>
	<?php else : ?>
	    <a href="<?php echo wp_login_url(get_permalink()); ?>">Login</a>
	<?php endif;
}
add_shortcode( 'login_logout_link', 'xmit_login_logout' );