1-6 7-12 13-18 19-24 25-30 31-36 37-42 43-48 49-54 55-60 61-66 67-72 73-78 79-84 85-90 91-96 97-102 103-108 109-114 115-120 121-126 127-132 133-138 139-144 145-148