?-tuple. In the event the index set is definitely the list of all all-natural numbers an indexed spouse and children is referred to as a sequence.to lead to to prevent or adhere; to obstruct; to fasten to your place; hence, to occasion problem to; to embarrass; as, to set a coach in the mudB?t k? ai ?ang kinh doanh khi b?t ??u n?m m?i ??u th?c hi?n