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$ git checkout master
> Switched to branch 'master'
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$ git remote -v
> origin https://github.com/YOUR_USERNAME/YOUR_FORK.git (fetch)
> origin https://github.com/YOUR_USERNAME/YOUR_FORK.git (push)
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$ git remote add upstream https://github.com/ORIGINAL_OWNER/ORIGINAL_REPOSITORY.git
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$ git fetch upstream
> remote: Enumerating objects: 82, done.
> remote: Counting objects: 100% (82/82), done.
> remote: Compressing objects: 100% (44/44), done.
> remote: Total 91 (delta 53), reused 30 (delta 30), pack-reused 9
> Unpacking objects: 100% (91/91), done.
> From https://github.com/ORIGINAL_OWNER/ORIGINAL_REPOSITORY
> * [new branch] master -> upstream/master
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$ git remote -v
> origin https://github.com/YOUR_USERNAME/YOUR_FORK.git (fetch)
> origin https://github.com/YOUR_USERNAME/YOUR_FORK.git (push)
> upstream https://github.com/ORIGINAL_OWNER/ORIGINAL_REPOSITORY.git (fetch)
> upstream https://github.com/ORIGINAL_OWNER/ORIGINAL_REPOSITORY.git (push)