Hello. There is a mistake in the answer to question 98 . You need to change `A: [1, [2, 3, 4]] and undefined` → `A: [1, [2, 3, 4]] and SyntaxError` https://github.com/lydiahallie/javascript-questions/tree/master/ru-RU#97-%D0%BA%D0%B0%D0%BA%D0%BE%D0%B9-%D0%B1%D1%83%D0%B4%D0%B5%D1%82-%D0%B2%D1%8B%D0%B2%D0%BE%D0%B4