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function my_wp_nav_menu_args( $args = '' ) {
 
if( is_user_logged_in() ) { 
    $args['menu'] = 'logged-in';
} else { 
    $args['menu'] = 'logged-out';
} 
    return $args;
}
add_filter( 'wp_nav_menu_args', 'my_wp_nav_menu_args' );