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What is the difference between sending a transaction with no to field and create() opcode ?

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Both create a contract.

An externally owned account (EOA) creates a contract by sending a transaction with no to field.

A contract (account) creates another contract by using the CREATE opcode.

It's cheaper gas-wise for a contract to create another contract, than an EOA to create a contract (TODO fill in gas costs). This question inspires Can the CALL opcode be used to create a contract?

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