is called first returning <code>"zoooom"</code> only if <code>isFueled</code> is
true. Then the inline expression is called, rendering the nested helper's
value (<code>"zoooom"</code>) only if <code>isFast</code> is true.</p>
<p>The third form of helper usage is <strong>block invocation</strong>. Use block helpers
to render only part of a template. Block invocation of a helper can be
recognized by the <code>#</code> before the helper name, and the closing <code>{{/</code> double
curly brace at the end of th