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https://github.com/OpenZeppelin/openzeppelin-contracts/blob/90ed1af972299070f51bf4665a85da56ac4d355e/contracts/GSN/GSNRecipientERC20Fee.sol

Where can I find the specific contract implementation for the part _unstable__ERC20Owned where "" " token = new __unstable__ERC20Owned (name, symbol);" "" in the above url?

There should be a file defined as a type because it is used for "using". If this (__unstable__ERC20Owned) is not a contract, where can I find its concrete implementation? Or there is no concrete implementation Is it?

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_unstable__ERC20Owned is a contract. You can find it in your file at the line 118.

A same file can include several contracts.

For exemple here you have two contracts in the same file : GSNRecipientERC20Fee and _unstable__ERC20Owned. The first one instantiates the second one in its constructor.

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