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Storage.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

contract Storage {
  uint256 number;

  function store(uint256 num) public {
    number = num;
  }

  function retrieve() public view
    returns(uint256) {
    return number;
  }
}

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Selected line

number = num;

This line writes the input value num into the state variable number, persisting it on-chain.

State writes cost gas and require a signed transaction.

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