How do I tell Twig not to print any form field? I am trying to theme a form in Drupal 8.

This is the template that I am using which is basically from form.html.twig

&lt;form{{ attributes }}&gt;
{{ element.app_theme_settings }}
{{ element.a2 }}
{{ element.a3 }}

 {% print remaining required form fields. %}
 {{ children }}
&lt;/form&gt; 


My problem is I want to print children variable but without app_theme_settings, a2 and a3 children. In Drupal 7 we could use unset function, but in twig I am not sure what to use. I know I can use without filter, but it does not accept the array argument so I have to write name of each element already printed.

 {{ children|without('app_theme_settings','a2','a3' }}


How can I print children without specifying the name of each field one by one?
Loop through the keys

{% for key in element|keys %}
    {{ children|without(key) }}
{% endfor %}