Question: how many clean sheets does petr cech have
[{'answer': '24', 'provenance': [{'wikipedia_id': '40507566', 'title': 'List of Premier League goalkeepers with 100 or more clean sheets', 'start_paragraph_id': 4, 'start_character': 79, 'end_paragraph_id': 4, 'end_character': 81, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '40507566', 'title': 'List of Premier League goalkeepers with 100 or more clean sheets', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 325, 'bleu_score': 0.905341140211783, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9292293126351593441}, 'section': 'Section::::Abstract.'}]}]