How many stations are transmitted on frequency 7 uhf?
{'header': ['Television Station', 'Frequency', 'Site', 'Transmitted', 'Network', 'Status', 'Country of Region'], 'page_title': '', 'section_title': '', 'caption': '', 'rows': [['TV1', '28 UHF', 'Gunung Ledang', '10 kW/800 kW ERP', 'Radio Televisyen Malaysia (RTM)', 'National', 'Malaysia'], ['TV2', '7 UHF', 'Gunung Ledang', '10 kW/800 kW ERP', 'Radio Televisyen Malaysia (RTM)', 'National', 'Malaysia'], ['TV3', '12 UHF', 'Gunung Ledang', '20 kW', 'Media Prima Berhad', 'National', 'Malaysia'], ['NTV7', '35 UHF', 'Gunung Ledang', '20 kW', 'Media Prima Berhad', 'National', 'Malaysia'], ['8TV', '48 UHF', 'Gunung Ledang', '20 kW', 'Media Prima Berhad', 'National', 'Malaysia']]}