old_contents: """The vumi.dispatchers API."""
  
  __all__ = ["BaseDispatchWorker", "BaseDispatchRouter", "SimpleDispatchRouter",
             "TransportToTransportRouter", "ToAddrRouter",
             "FromAddrMultiplexRouter", "UserGroupingRouter"]
  
  from vumi.dispatchers.base import (BaseDispatchWorker, BaseDispatchRouter,
                                     SimpleDispatchRouter,
                                     TransportToTransportRouter, ToAddrRouter,
                                     FromAddrMultiplexRouter,
                                     UserGroupingRouter)
  
new_contents: """The vumi.dispatchers API."""
  
  __all__ = ["BaseDispatchWorker", "BaseDispatchRouter", "SimpleDispatchRouter",
             "TransportToTransportRouter", "ToAddrRouter",
             "FromAddrMultiplexRouter", "UserGroupingRouter",
             "ContentKeywordRouter"]
  
  from vumi.dispatchers.base import (BaseDispatchWorker, BaseDispatchRouter,
                                     SimpleDispatchRouter,
                                     TransportToTransportRouter, ToAddrRouter,
                                     FromAddrMultiplexRouter,
                                     UserGroupingRouter, ContentKeywordRouter)
  
subject: Add ContentKeywordRouter to vumi.dispatchers API.