barbed wire parenthesis in LaTeX

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How to typeset in LaTex barbed wire brackets as used to denote paramorphism in the paper "Functional Programming with Bananas, Lenses, Envelopes and Barbed Wire"?

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Using answers to this question I was able to come up with:

\DeclareMathOperator{\lbarb}{\mathrel{\ooalign{\hss(\hss\cr\{}}}
\DeclareMathOperator{\rbarb}{\mathrel{\ooalign{\hss)\hss\cr\}}}}