As we know that Minecraft PE update 1.16.0.52 adds new blocks / items / biomes / mob / tools and weapons, one of which is chain And we also know that Minecraft has long had chainmail armor but unfortunately the mojang doesn't add crafting to make this armor when we are in survival mode. we can only get this armor in dungeons, temples, or trade with villagers
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Changelog
add chainmail armor crafting for survival and just for fun
(sorry, for my bad english)