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== Suffix ==
A string <math>s</math> is a suffix<ref name=Lot97/> of a string <math>t</math> if there exists a string <math>p</math> such that <math>t = ps</math>. A ''proper suffix'' of a string is not equal to the string itself. A more restricted interpretation is that it is also not empty.{{ref|Gus97}}
Example: The string <code>nana</code> is equal to a suffix (and substring and subsequence) of the string <code>banana</code>:
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