Question: what countries did the western front run through
[{'answer': 'Belgium', 'provenance': [{'wikipedia_id': '51499', 'title': 'Western Front (World War I)', 'start_paragraph_id': 1, 'start_character': 188, 'end_paragraph_id': 1, 'end_character': 195, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'north - eastern France'}, {'answer': 'Alsace - Lorraine', 'provenance': [{'wikipedia_id': '51499', 'title': 'Western Front (World War I)', 'start_paragraph_id': 68, 'start_character': 501, 'end_paragraph_id': 68, 'end_character': 519, 'bleu_score': 1.0, 'section': 'Section::::Aftermath.\n'}]}, {'answer': 'Alsace - Lorraine ( today France )'}]