This service returns a, possibly empty, list of those strings that are in one of the input lists or in both. For example, the input parameters ['a','b','c'] and ['a','e','c'] will return a list whose elements are in the set ['a','b','c','e']. The input values  and  will return an empty list . Note that the order of elements in the returned list should not be relied upon.
Example workflows can be found on myExperiment showing: