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It has been suggested that when creating a smart contract it is better to follow the following stages (1) design (2) code (3) develop (4) deploy a smart contract on a test chain and thoroughly then (5) deploy on a production blockchain. Why do you think this is necessary?

because that is the rule of implementing smart contract

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because when the smart contract is deployed, it is immutable

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because when the smart contract is deployed, the hash keys will be decodeable

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because when the smart contract is deployed, the private keys are in 256 bit

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