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Concept of challenge and difficulty in the study

Stock Photo:
Image ID: 171400709
Release Information:
Signed model release filed with Shutterstock, Inc
Copyright:
Small
500x395 6.9"x5.5" (72dpi) 129 KB
Med
1000x789 3.3"x2.6" (300dpi) 482 KB
Large
6016x4747 20.1"x15.8" (300dpi) 14.3 MB
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