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<?php 
                      if ( is_user_logged_in() ) { 
                        echo '<a href="'.wp_logout_url( get_permalink() ).'" title="Logout" class="login">Выйти</a>'; 
                          } else { 
                            echo '<a href="'.wp_login_url( get_permalink() ).'" title="Login" class="login">Войти</a>'; }
                        ?>