(VAR x y z) (RULES rev(nil) -> nil rev(.(x,y)) -> ++(rev(y),.(x,nil)) car(.(x,y)) -> x cdr(.(x,y)) -> y null(nil) -> true null(.(x,y)) -> false ++(nil,y) -> y ++(.(x,y),z) -> .(x,++(y,z)) ) (COMMENT Example 2.39 (List) in \cite{SK90})
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