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My Cell Prison - Chapter 142 - : Exchange
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Chapter 141 - : Points
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Chapter 143 - : Return Journey
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... copper is a metal material, and its price is 50 times higher! By taking the copper ore back for smelting, you can get the most metal and also have high variability.
Moreover, most of the copper we currently use is mainly for building city walls, constructing secret defenses, or expanding the Holy City.
A city wall only needs 50% copper content to isolate ‘life outside the city’, so there’s no need to use pure copper… On the contrary, by integrating other metals or special stones ...
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