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  1. or download this
    my  $output = "";
for (1 .. 1000) {
   $output .= get_long_string();
}
print $output;
  2. or download this
    StringBuffer output = new StringBuffer();
for (1 .. 1000) {
   output.appends(get_long_string());
}
System.out.print(output.toString());
  3. or download this
    my  $output = "";
for (1 .. 1000) {
   $output = "" . get_long_string() . $output;
}
print $output;