const originalData = [ { name: ‘liu’, age: 30, score: 80, gender: 1, lesson: ‘math’ }, { name: ‘wu’, age: 31, score: 70, gender: 1, lesson: ‘math’ }, { name: ‘maks’, age: 27, score: 900, gender: 0, lesson: ‘math’ }, { name: ‘liu’, age: 30, score: 80, gender: 1, lesson: ‘english’ } ];

问题：返回一个平均分计算结果，按照 lesson and gender分组; 例如：returns { math: { 0: 73, 1: 82 }, english: { 0: 65, 1: 43 } }

答案：？