question: What are the four categories of terra nullius ?
answer: the small unclaimed territory of Bir Tawil between Egypt and Sudan , Antarctica , the oceans , and celestial bodies
turker_answer: The four categories of terra nullius are the small unclaimed territory of Bir Tawil between Egypt and Sudan , Antarctica , the oceans , and celestial bodies .
rule-based: The four categories of terra nullius are the small unclaimed territory of Bir Tawil between Egypt and Sudan , Antarctica , the oceans , and celestial bodies .