(VAR x y z) (RULES f(x,g(y)) -> f(h(x),i(x,y)) i(x,j(0,0)) -> g(0) i(x,j(y,z)) -> j(g(y),i(x,z)) i(h(x),j(j(y,z),0)) -> j(i(h(x),j(y,z)),i(x,j(y,z))) j(g(x),g(y)) -> g(j(x,y)) ) (COMMENT Example 4.58 (Battle of Hydra and Hercules) in \cite{SK90})
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