#### Reverting the Working Tree to an Earlier Commit   On many occasions it will be helpful to revert the working tree the state in a previous commit, either temporarily or permanently. You may find the book _Pro Git_ helpful in answering these questions.   a. **Ancestry References** are relative commit references and there are (of course) two forms with subtly different behaviours: the `^` (caret) or `~` (tilde). What is the difference between the two _and_ will this difference be relevant with the branching strategy used in ENGR 301? b. **Commit Ranges** are useful with `git log` and other commands which will operate on ranges of commits, with the most common syntaxes being the `..` (double dot) and `...` (triple dot). What is the difference between these two syntaxes in practice?   c. The **RefLog** is useful when a mistake has been made and previous versions of files need to be recovered. What is the RefLog, i.e. what does `git reflog` show and what is the most basic limitation in its ability to be used to retrieve work deleted from the working tree?

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