Challenge 1
Complete the Git command to replay commits onto a new base.
git main
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Create a disposable repository with a base commit. Create a topic branch and commit topic work. Advance main with a separate commit. Return to topic and run `git rebase main`. Record the topic tip before and after, prove the IDs differ, prove the new topic tip descends from main, and verify that main itself did not move. Do not use interactive rebase or resolve a conflict here; those are later ownership boundaries.
Challenge 1
git main
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Challenge 2
git origin/main
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Challenge 3
git -c topic
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Challenge 4
git main
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