A read-write interface to a set of strings. We define this in favor of using a standard Java collections interface so that we can write an optimized implementation for GWT. Null is not permitted as a value. All methods, even {@link #contains(String)}will throw an exception for null values.
@author ohler@google.com (Christian Ohler)
A set of strings which can be converted to and from a single string. The constructor splits a group of strings separated by ';' into a set, and the toString() method joins all the string together with ';'.
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