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Back view of chairs in physics school class; blackboard with formula

Stock Photo:
Image ID: 83894791
Small
500x334 6.9"x4.6" (72dpi) 203 KB
Med
1000x667 3.3"x2.2" (300dpi) 678 KB
Large
5616x3744 18.7"x12.5" (300dpi) 8.0 MB
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