Question: who are the main characters in all summer in a day
[{'answer': 'Margot', 'provenance': [{'wikipedia_id': '799533', 'title': 'All Summer in a Day', 'start_paragraph_id': 4, 'start_character': 21, 'end_paragraph_id': 4, 'end_character': 27, 'bleu_score': 1.0, 'section': 'Section::::Plot synopsis.\n'}]}, {'answer': 'William', 'provenance': [{'wikipedia_id': '799533', 'title': 'All Summer in a Day', 'start_paragraph_id': 6, 'start_character': 175, 'end_paragraph_id': 6, 'end_character': 182, 'bleu_score': 1.0, 'section': 'Section::::Plot synopsis.\n'}]}, {'answer': 'Paula', 'provenance': [{'wikipedia_id': '799533', 'title': 'All Summer in a Day', 'start_paragraph_id': 15, 'start_character': 29, 'end_paragraph_id': 15, 'end_character': 34, 'bleu_score': 1.0, 'section': 'Section::::Adaptations.:Short Film Cast.\n'}]}, {'answer': 'Michael', 'provenance': [{'wikipedia_id': '799533', 'title': 'All Summer in a Day', 'start_paragraph_id': 16, 'start_character': 29, 'end_paragraph_id': 16, 'end_character': 36, 'bleu_score': 1.0, 'section': 'Section::::Adaptations.:Short Film Cast.\n'}]}, {'answer': 'Lisa', 'provenance': [{'wikipedia_id': '799533', 'title': 'All Summer in a Day', 'start_paragraph_id': 17, 'start_character': 29, 'end_paragraph_id': 17, 'end_character': 33, 'bleu_score': 1.0, 'section': 'Section::::Adaptations.:Short Film Cast.\n'}]}, {'answer': 'Mrs. Callaghan', 'provenance': [{'wikipedia_id': '799533', 'title': 'All Summer in a Day', 'start_paragraph_id': 18, 'start_character': 28, 'end_paragraph_id': 18, 'end_character': 41, 'bleu_score': 1.0, 'section': 'Section::::Adaptations.:Short Film Cast.\n'}]}]