The Bulletin of Engineering Geology and the Environment (Vol. 69, 2010) published a study of cemented sandy soils. The researchers applied one of three different sampling methods (rotary core, metal tube, or plastic tube) to randomly selected soil specimens, then measured the effective stress level (Newtons per meters-squared) of each specimen. Each method was applied to 10 soil specimens-a total of 30 measurements in all. For this completely randomized design, use a random number generator to assign the sampling methods to the soil specimens. List the soil specimens that are to be analyzed by each method?