Which continents don't have any land in the Southern Hemisphere?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q41228', 'id': 0, 'label': 'Southern Hemisphere'}, {'type': 'INTERNAL', 'name_': 'Q18', 'id': 1, 'label': 'South America'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q49', 'id': 2, 'label': 'North America'}], 'links': [{'name_': 'P706', 'source': 1, 'target': 0, 'label': 'located in/on physical feature'}, {'name_': 'P47', 'source': 1, 'target': 2, 'label': 'shares border with'}, {'name_': 'P47', 'source': 2, 'target': 1, 'label': 'shares border with'}]}