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Visibility Specifier in Solidity:

Functions can be declared as

public: any contract and account can call
private: only inside the contract of the function
internal: only inside contract that inherits an internal function
external: only other contracts and accounts

State variables can't be declared as external.

In order to be able to check it, I have to learn a programming language
74 $DEGEN

thx for nice information ☺️ 

72 $DEGEN

very useful information. thank you 

67 $DEGEN

Thanks for sharing dear friend 
73 $DEGEN for you