# Return a list of elements between 'from' and 'to'.
	fun slice(from: Int, to: Int): List[E] do
		assert from >= 0 and from < length
		assert to >= 0 and to < length and from <= to
		var list = new List[E]
		while from <= to do
			list.add(self[from])
			from += 1
		end
		return list
	end