{% block block1 %}from template a.html{% endblock %} {% block block2 %}from template a.html{% endblock %} {% block block3 %}from template a.html{% endblock %} {% block block4 %} nested block from template a.html {% block block5 %} contents of the nested block from a.html {% block block6 %} double nested block. {% endblock %} {% endblock %} {% endblock %}