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maths and science formula on whiteboard
Male teacher writing various high school maths and science formula on whiteboard
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Sep.22, 2012 10:17:03
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GREEN WHITE BACKGROUND ON HIGH SIGN BOARD PATTERN MALE MAN BLACK FORMULA HAND CONCEPT SCHOOL COMPLEX FINGERS PROFESSIONAL WRITING PEN DRAWING LEARNING EDUCATION SCIENCE LEARN IN STUDY COLLEGE STUDENT UNIVERSITY CHEMISTRY LESSON KNOWLEDGE VARIOUS WRITE GRAPH THEORY TEACH SCIENTIFIC MATHEMATICS TEACHER CLASS PROFESSOR ALGEBRA SCRIBBLE CLASSROOM CALCULATE GYMNASIUM STUDENTS WHITEBOARD