How to display clone fields subgroup

How to display clone fields using the example below?

Can give me an example of displaying clones courses within an echo

Note that my phone is clone field, and I ebixir the phone clones items on display sample field below

add_filter( 'rwmb_meta_boxes', 'prefix_register_contacts' );
function prefix_register_contacts( $meta_boxes ) {
    $meta_boxes[] = array(
        'title' => __( 'Contacts', 'textdomain' ),
        'post_types' => 'post',
        'fields' => array(
            array(
                'id' => 'contacts',
                'type' => 'group',
                'clone' => true,
                'fields' => array(
                    array(
                        'id' => 'name',
                        'type' => 'text',
                        'name' => __( 'Name', 'textdomain' ),
                    ),
                    array(
                        'id' => 'email',
                        'type' => 'text',
                        'name' => __( 'Email', 'textdomain' ),
                    ),
                    array(
                        'id' => 'phone',
                        'type' => 'text',
                        'name' => __( 'Phone', 'textdomain' ),
                        'clone' => true, 
                    ),
                ),
            ),
        ),
    );
    return $meta_boxes;
}

Display

$contacts = rwmb_meta( 'contacts' );
if ( ! empty( $contacts ) ) {
    foreach ( $contacts as $contact ) {
        echo '<div class="contact">';
        echo '<h4>', __( 'Contact info', 'textdomain' ), '</h4>';
        echo '<p><label>', __( 'Name:', 'textdomain' ), '<label> ', $contact['name'], '</p>';
        echo '<p><label>', __( 'Email:', 'textdomain' ), '<label> ', $contact['email'], '</p>';
        echo '<p><label>', __( 'Phone number:', 'textdomain' ), '<label> ', $contact['phone'], '</p>';
        echo '</div>';
    }
}