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I claim the ornamental design for a grain sampler, as shown and described.
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FIG. 1 is a top plan view of the grain sampler.
FIG. 2 is a side elevation view of the grain sampler.
FIG. 3 is a bottom plan view of the grain sampler.
FIG. 4 is a front end view of the grain sampler.
FIG. 5 is a rear end view of the grain sampler.
FIG. 6 is a top perspective view of the grain sampler; and,
FIG. 7 is a bottom perspective view of the grain sampler.
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