Runs this execution list, executing all existing pairs in the order they were added. However, note that listeners added after this point may be executed before those previously added, and note that the execution order of all listeners is ultimately chosen by the implementations of the supplied executors.
This method is idempotent. Calling it several times in parallel is semantically equivalent to calling it exactly once.
@since Guava release 10 (present in release 01 as {@code run})
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