var xs from kv in let lst kv Value from item in lst select new List ls

	var xs =
		from kv in d
		let lst = kv.Value
		from item in lst
		select new {List = lst, Item = item};
	var maxValue = xs.Max(x => x.Item.Val);
	var toRemove = xs.First(x => x.Item.Val == maxValue);
	toRemove.List.Remove(toRemove.Item);