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for (; $first <= $last; $first++) {
 print $c->article($first);
}

($first, $last) = ($newserver->group($newsgroup));
my @messages = ($first..$last);
foreach (@messages) {
  print $c->article($_);
}

($first, $last) = ($newserver->group($newsgroup));
my @messages = ($first..$last);
...
foreach (@messages) {
  print $c->article($_);
}