NewElement = rebuild(List),
NEWLIST = [NewElement, X, Y].

rebuildlist(List) ->
		case is_list(hd(List)) of

		true -> tl(List);

		false ->    ????

	end.


if I have a list like this [[4,5],[6,8,0]] then it evaluates true and I get the tail
if I have a list like [5,6,7,8,9,9] then it evaluates false, I dont need anything from this list.