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#include <array>
namespace nd_array {
template <typename T, int... NS> struct NDArrayFactory;
template <typename T, int N0, int... NS> struct NDArrayFactory<T, N0, NS...> {
using Array = std::array<typename NDArrayFactory<T, NS...>::Array, N0>;
};
template <typename T, int N0> struct NDArrayFactory<T, N0> {
using Array = std::array<T, N0>;
};
} // namespace nd_array
template <typename T, int... NS>
using NDArray = typename nd_array::NDArrayFactory<T, NS...>::Array;
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