6-9 10-13 14-17 18-21 22-25 26-29 30-33 34-37 38-41 42-45 46-49 50-53 54-57 58-61 62-65 66-69 70-73 74-77 78-81 82-85 86-89 90-93 94-97 98-101 102-105 106-109 110-113 114-117 118-121 122-125 126-129