Question: what is the meaning of hcf in mathematics
[{'answer': 'highest common factor', 'provenance': [{'wikipedia_id': '12354', 'title': 'Greatest common divisor', 'start_paragraph_id': 2, 'start_character': 79, 'end_paragraph_id': 2, 'end_character': 100, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '12354', 'title': 'Greatest common divisor', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 164, 'bleu_score': 0.9214109120166031, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5560625978279308549}, 'section': 'Section::::Abstract.'}]}]