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Pen and a mathematical exercise.

Stock Photo:
Image ID: 42174100
Release Information: N/A
Copyright: Denys Dolnikov
Small
500x332 6.9"x4.6" (72dpi) 145 KB
Med
1000x664 3.3"x2.2" (300dpi) 411 KB
Large
4672x3104 15.6"x10.3" (300dpi) 2.8 MB
Super
9344x6208 31.1"x20.7" (300dpi) approx.6.8 MB
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