Male in white coat with instruction stick 7
Male in white coat with blank paper 1
Chalk, chalk, compass, protractor, eraser and calculator
Men who wearing white coats making nets on the chest
Businessman Guts 9
A person is writing chalk on a blackboard with chalk 7
Male in white coat with medical certificate 1
Businessman pointing 1
Girl scribbling 16
Chalkboard with graphs 3
Male in white coat with instruction stick 1
Blackboard, compass, protractor, eraser and calculator
Characters written on the blackboard 11
Blackboard hung on the wall 12
Businessman Guts 8
Teachers to teach and elementary school children 13
Chalk character 54
Male wearing a white coat with her arms 2
Chalk, chalk, pencil, calculator and protractor with blackboard, note 2
Businessman 21
Mask businessman 2
Male wearing a white cloth in trouble 3
Businessman with money 4
Schoolgirl posing
Male wearing white coat under consideration 2
Chalk written in chalk 35
A man wearing a white suit with money
Characters written in chalk 47
Thinking businessman 2
"Leadership" written in chalk
Male wearing a white garment that touches your finger 8
Chalk character 8
Businessman 4
Female college student 5 standing in front of the blackboard
A blackboard hung on the wall 29
A woman drawing a graph on a blackboard 15
Elementary school teacher in front of the blackboard 7
High school students reading textbooks
Businessman personal computer 11
Picture written in chalk 14
Businessman 6
Chalk character 46
Classroom desk 5
A person is writing chalk on a blackboard with chalk 5
Thinking businessman 6
A man wearing a white suit to make a big cross
Elementary school students and teachers in front of the blackboard 6
Elementary school student with blackboard 5
Male guiding white clothes to guide 2
Chalk character 1
Chalk, chalk, pencil, calculator, protractor and notebook with blackboard
Pointing 2
Male in a white garment that touches your finger 7
Chalkboard and chalk 3
A man wearing a white suit with a change job card
Businessman 2
Male in a white cloth worrying 2
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