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Please select (and click on) the sketch that most resembles your unknown grain - in shape only
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 sketch 44
 sketch 45
 sketch 46
sketch 20
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 sketch 28 sketch 26
sketch 30 sketch 27 sketch 32 sketch 29 sketch 25
sketch 31 sketch 35 sketch 40 sketch 37 sketch 33
sketch 39
 sketch 36
 sketch 34
 sketch 41 sketch 47
sketch 38 sketch 42
 sketch 43
 sketch 48
 sketch 49
sketch 4
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sketch 50
sketch 1
 sketch 2
 sketch 3 sketch 8
 sketch 7
sketch 51
 sketch 52
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