Blame test/pamfile.ok

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testimg.ppm:	PPM raw, 227 by 149  maxval 255
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testgrid.pbm:	PBM raw, 14 by 16
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stdin:	PGM raw, 227 by 149  maxval 255
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stdin:	PAM, 227 by 149 by 1 maxval 255
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    Tuple type: GRAYSCALE