[['race name', 'dist (miles)', 'course', 'prize', 'jockey', 'odds', 'runners'], ['great subscription purse', '4', 'york', '160 5s', 'christopher jackson', '1 / 2', '3'], ['not known', 'not known', 'morpeth', '50', 'not known', 'not known', 'not known'], ["ladies' plate", '4', 'york', '126 gs', 'not known', 'not known', 'not known'], ["ladies' plate", 'not known', 'lincoln', '80', 'not known', 'not known', 'not known'], ['unnamed race', 'not known', 'morpeth', '50', 'none', 'not known', 'walkover'], ['unnamed race', '4 m 1.5f', 'newmarket', '50', 'not known', '4 / 5 6s', '4'], ['open race', 'not known', 'york', '20', 'none', 'none', 'no entries'], ['match race', '4 m 1.5f', 'newmarket', '200 gs', 'john singleton', '1 / 2', '2'], ['jockey club plate', 'not known', 'newmarket', 'not known', 'not known', '2 / 1 first heat', '6'], ['unnamed race', 'not known', 'newcastle', '60 gs', 'not known', 'not known', '3'], ['jockey club plate', 'not known', 'newmarket', 'not known', 'not known', '10 / 1', '5'], ['unnamed race', 'not known', 'scarborough', '50', 'not known', '10 / 1', '3']]
the Name of the Jockey are only Known for 2 Race
the [ENT] of the [ENT] are only [ENT] for [ENT] [ENT]