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 A PR will be reviewed by commiters committers and they may ask you additionnal additional work.To easy your work it's better to create a branches per feature you want to submit as Pull Request.

creating Creating and pointing at  a new branch from master required requires 3 steps

1. git checkout master
2. git branch mywork
3. git checkout mywork

You can then code, commit and push to your forked repository. You can then use the github UI to create a Pull request from your branchebranch.

https://help.github.com/articles/creating-a-pull-request/

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