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# sorting by oldest first seems to give the best chance for accurate m
+essage threading.
        # I apologize for the nasty parens nesting scheme as well.
        foreach (sort {
...
            }
            print STDERR "I have ". keys (%placed) . " items\n";
        }

    sub get_refs {    
        my $msg_refs = shift;
        my $msg_list = shift;
...
        }            
        return undef;
    }