Remove all 'available since' notices
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@ -15,9 +15,6 @@ pragma solidity ^0.6.0;
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* TIP: If you would like to learn more about reentrancy and alternative ways
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* to protect against it, check out our blog post
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* https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
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*
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* _Since v2.5.0:_ this module is now much more gas efficient, given net gas
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* metering changes introduced in the Istanbul hardfork.
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*/
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contract ReentrancyGuard {
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bool private _notEntered;
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