With the given points of 51, what was the total number of the try bonus?
{'header': ['Club', 'Played', 'Won', 'Drawn', 'Lost', 'Points for', 'Points against', 'Tries for', 'Tries against', 'Try bonus', 'Losing bonus', 'Points'], 'page_title': 'WRU Division Five South West', 'page_id': '', 'types': ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text'], 'id': '1-17675675-2', 'section_title': 'League table', 'caption': 'League table', 'rows': [['Club', 'Played', 'Won', 'Drawn', 'Lost', 'Points for', 'Points against', 'Tries for', 'Tries against', 'Try bonus', 'Losing bonus', 'Points'], ['Betws RFC', '20', '18', '0', '2', '727', '243', '111', '29', '14', '2', '88'], ['Ystradgynlais RFC', '20', '18', '0', '2', '667', '200', '107', '24', '15', '1', '88'], ['Alltwen RFC', '20', '15', '1', '4', '434', '237', '55', '21', '7', '1', '70'], ['New Dock Stars RFC', '20', '11', '1', '8', '367', '318', '51', '38', '5', '4', '55'], ['Pontardawe RFC', '20', '10', '0', '10', '441', '381', '64', '51', '9', '4', '53'], ['Trebanos RFC', '20', '10', '1', '9', '441', '404', '51', '58', '5', '4', '51'], ['Glais RFC', '20', '9', '0', '11', '293', '325', '36', '42', '4', '5', '45'], ['Gowerton RFC', '20', '7', '0', '13', '313', '468', '38', '69', '2', '4', '34'], ['Cwmtwrch RFC', '20', '5', '2', '13', '261', '406', '28', '58', '0', '4', '28'], ['Swansea Uplands RFC', '20', '2', '1', '17', '197', '574', '28', '89', '1', '2', '13'], ['Bynea RFC', '20', '2', '0', '18', '139', '724', '21', '111', '1', '1', '10']], 'name': 'table_17675675_2'}