Question: why did they change characters in our girl
[{'answer': 'after the first series', 'provenance': [{'wikipedia_id': '38909754', 'title': 'Our Girl', 'start_paragraph_id': 2, 'start_character': 21, 'end_paragraph_id': 2, 'end_character': 43, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'third series', 'provenance': [{'wikipedia_id': '38909754', 'title': 'Our Girl', 'start_paragraph_id': 2, 'start_character': 328, 'end_paragraph_id': 2, 'end_character': 340, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '38909754', 'title': 'Our Girl', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 923, 'bleu_score': 0.976181511863994, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17632527877006868985}, 'section': 'Section::::Abstract.'}]}]