If you think you can write a footnote like [1], you've probably just created a link to this node. You're probably better off embedding it in <C> tags: if you enter <C>[1]</C> it will look like [1].
And if you look down below the submission box at the helpful hints you've long since stopped reading, they recommend using numbered html entities like [1], but that seems like too much work to me.
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Perl Monks Discussion