1-4 5-8 9-12 13-16 17-2021-24 25-28 29-32 33-36 37-40 41-44 45-48 49-52 53-56 57-60 61-64 65-68 69-72 73-76 77-80 81-84 85-88 89-92 93-96 97-100 101-104 105-108 109-112 113-116 117-120 121-124 125-128