how to revert pull request in git code example

Example 1: undo git pull

git reset --hard master@{"10 minutes ago"}

Example 2: how to reverse a git pull

git reset --hard master@{"10 minutes ago"}

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git reset --keep HEAD@{1}

Example 3: git revert pr merge

git revert -m 1 b76a5f1f5d3b323679e466a1a1d5f93c8828b269 (Commit Number)