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\begin{isabelle}%
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~{"}let~(x,y)~=~f~z~in~(y,x){"}~{"}case~xs~of~[]~{\isasymRightarrow}~0~|~(x,y)\#zs~{\isasymRightarrow}~x+y{"}\isanewline
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\end{isabelle}%
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%%% Local Variables:
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%%% mode: latex
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%%% TeX-master: "root"
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%%% End: