[texhax] barbed wire brackets

[Reinhard Kotucha]

Eric writes:

 > Hi all,
 > 
 > Does anyone know the latex macro for displaying barbed wire brackets (as 
 > seen in the paper `Functional Programming with Bananas, Lenses, 
 > Envelopes and Barbed Wire)?

I must admit that I'm not very familiar with bananas and lenses.
Maybe I'm a bit more familiar with bananas than with lenses.  I
personally prefer oranges and tomatoes anyway.  Please check first
whether there is something useful in

  http://www.ctan.org/tex-archive/info/symbols/comprehensive/symbols-a4.pdf

If there is no appropriate symbol available, you can probably define
it yourself, see 

  http://www.ctan.org/tex-archive/graphics/pgf/doc/generic/pgf/version-for-pdftex/en/pgfmanual.pdf 

Regards,
  Reinhard

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