I thought I’d repeat a puzzle that I first posted five years ago.
Put these in order by moving the fewest names:
Washington, Wilson, Johnson, Johnson, McKinley, Davis, Jackson, Taft, Kennedy
Moving a name to between two other names, before the first name, or after the last name all count as one move. Thus, exchanging #2 and #7 requires two moves (since you’d have to move #2 and then move #7).
Note that “order” need not necessarily mean chronological order.