The format of %s is: %s{question,default_answer}.
When git encounters a %s in the `formatted-command' it asks
the user the question `question' whose default answer is
`default_answer' and replaces the `%s{ , }' with the user's
answer. Both `question' and `default_answer' can contain any
other `format specifiers' except %s.
Note that there should be no spaces between %s and '{'.
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