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  1. or download this
    <level1 id="L1_0001">
    <level2>
...
<level1 id="L1_0003">
    <level2>
        <level3>
  2. or download this
    <level1 id="L1_0001">
    <level2  id="L1_0001">
...
<level1 id="L1_0003">
    <level2 id="L1_0003">
        <level3>
  3. or download this
    $content =~s#(<level1 id=\"([^"]*)\"(?:(?!<level1).)*?)<level2>#$1<lev
+el2 id="$2">#gsi;
  4. or download this
    <level1 id="L1_0001">
    <level2 id="L1_0001">
...
<level1 id="L1_0003">
    <level2 id="L1_0003">
        <level3>