Multiple blocks of same name in Jinja2

In Jinja2, I have a base template like this:

<title>{% block title %}{% endblock %} -</title>

  {% block title %}{% endblock %} -

Jinja2, then, fails with the following message:

  lines = [self.message, '  ' + location]
: block 'title' defined twice

It must be now evident as to what I am trying to do – to have the same title in two places: the TITLE tag and the H1 tag, but the part of the title is actually provided by other derived templates.

How does one typically achieve this?

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As documented here, defining a block creates a macro with the name of the block in the special “self” object:

<title>{% block title %}{% endblock %} -</title>

  {{ self.title() }} -