9.2.1 Select four specimens equally spaced along a diagonal
line extending from the lower left hand corner to the upper
right hand corner of the laboratory sample. Neither specimen A
or D shall be closer to the corner of the laboratory sample than
200 mm (8 in.).
9.2.2 Take specimen A at the center of the sample, B at one
corner (center located 200 mm (8 in.) from the corner), C
midway between A and B, and D the same distance from A as
C, located on a line with A, B, and C.