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  1. or download this
    use Tie::Cycle;

...
    {
    print qq|<tr class="$cycle">...</tr>\n|;
    }
  2. or download this
    <tr class="even">...</tr>
<tr class="odd">...</tr>
...
<tr class="even">...</tr>
<tr class="odd">...</tr>
<tr class="even">...</tr>
  3. or download this
    use Tie::Cycle;

...
    {
    print qq|<tr class="$cycle">...</tr>\n|;
    }