Rank Copper Includes

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/kit copper, /hat, /nick, /workbench, /stonecutter, /disposal

And Rank Copper Gains the Ability to Silk Spawners

Rank Iron Contains

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All Rank Coppers Commands and kits

/echest, 

Rank Gold Includes

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All Rank Copper, Iron Commands and Kits

/anvil, /grindstone

Rank Emerald Includes

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All of Copper, Iron, Gold Commands and Kits

Diamond Rank Includes

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All Copper, Iron, Gold, Emerald Commands and Kits

Rank Netherite Includes

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All Copper, Iron, Gold, Emerald, Diamond Commands and Kits