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the first example is still used ```pragma solidity ^0.4.16``` as the other examples in the same doc already update to ^0.4.21;
and in this example, it still have out of date comment for ```require```
// If the argument of `require` evaluates to `false`,
// it terminates and reverts all changes to
// the state and to Ether balances. It is often
// a good idea to use this if functions are
// called incorrectly. But watch out, this
// will currently also consume all provided gas
// (this is planned to change in the future).
(msg.sender == chairperson) &&
(voters[voter].weight == 0)