That was easy ;-).
The Semper Fidelis ambigram shown here is a medium length asymmetric ambigram that is a good example of the letters in one orientation flipping over to become different letters in another orientation.
The graphic to the left shows that this design reads 'Semper' when upright and reads 'Fidelis' when upside-down.
For a mental work-out, try to read it upside-down without rotating it (you can mouse over it at any time to make it spin).
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