User blog comment:Lykrast/Lementa/@comment-8084125-20131114200524/@comment-5686533-20131114204437

Well, 4 abilities with 5 ranks each, 4*5=20, max level is 18, 18=20-2.

So, yes ! 5/5/5/3 (you can change the order) or 5/5/4/4.