Question: in morse code which letter is represented by a single dot
[{'answer': 'E', 'provenance': [{'wikipedia_id': '18935', 'title': 'Morse code', 'start_paragraph_id': 2, 'start_character': 44, 'end_paragraph_id': 2, 'end_character': 45, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '18935', 'title': 'Morse code', 'start_paragraph_id': 2, 'start_character': 245, 'end_paragraph_id': 2, 'end_character': 1027, 'bleu_score': 0.6406768225814651, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7833586042347932612}, 'section': 'Section::::Abstract.'}]}]