def METHOD_NAME(ursulas):
    some_ursula = list(ursulas)[2]
    another_ursula = list(ursulas)[3]
    # These two have the same fleet state.
    assert some_ursula.known_nodes.checksum == another_ursula.known_nodes.checksum
    some_ursula._current_teacher_node = another_ursula
    result = some_ursula.learn_from_teacher_node()
    assert result is FLEET_STATES_MATCH