That said, what natural conditions? Given stone, bronze, iron, or steel? On an i

That said, what natural conditions? Given stone, bronze, iron, or steel? On an island, a forest, a plain, or mountains? In the arctic, the temperate, the steppe, or desert? Alone, in a band, a tribe, a nation, or an empire? In the presence of kin, kith, competitors, or enemies?

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