#!/usr/bin/perl
use warnings;
use strict;

print<<END_OF_VIAGRA;
  /
 |  x       n
 | e  = f(u)
 |
/
END_OF_VIAGRA

##</code><code>##

perl -e 'print "  /\n |  x       n\n | e  = f(u)\n |\n/\n"'