default visibility is internal;

the more stuff u do,the more gas u cost;

web3+deploy+metamask
view on etherscan
from add to contract creation

evm: ethereum virtual machine

done lesson two

in Solidity contracts mistakes cannot be edited or fixed; transactions cannot be reversed. Solidity follows the "Code is Law" mantra, which means any smart contract must be flawlessly coded when it comes into effect.

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