ast length-1 span.
        The containing span must be at least of length 1.

        Args:
            start: start offset of the containing span
            end: end offset of the containing span
            n: number of spans to embed

        Returns:
            list if embedded Spans

        &#34;&#34;&#34;
        l = end - start  # length of the containing span
        assert l &gt; 0
        if n == l:
            return [Span(start + i, start + i + 1) for i in range(n)]
        elif n &lt; l:
   