Sub Articulo 72.3

bla bla\nobreak\hfill e\break
The \break should be omitted if this is the end of the paragraph.
Without the \nobreak, TeX could break the line there and discard
the \hfill. The letter e would then end up at the beginning of the next
line. Without the \break, TeX could continue the line with additional
text. If the \break is placed at the end of a paragraph, there will be
and empty last line of the paragraph, causing an underfull hbox warning
and (possibly) unwanted vertical whitespace.
In LaTeX idioms:
bla bla bla\nolinebreak\hspace{\fill}e\linebreak