Blackboard and sponge 5
Elementary school students and teachers in front of the blackboard 9
Glasses businessman 1
Elementary school student writing on the blackboard 10
Picture 9 written in chalk 9
Mother and child to scribble 5
Male wearing a white suit to pose a guts 1
Men wearing a white coat to sams up 4
Male wearing a white suit to pose a guts 3
Businessman 1
Men wearing white coats to give OK sign 6
Female college student 5 reading a book in front of the blackboard
Handwritten Icon 38
Handwritten Icons 30
A blackboard on which a balloon of a graph is drawn and a woman 21
Chalk writing 4
Mother and child to scribble 4
Characters written on the blackboard 9
Checklist 7 written on a blackboard
Female with a mini blackboard
Male in white coat to operate iPad 1
Male wearing a white gown with abdominal pain 1
Male wearing a white garment that touches your finger 5
Gift box and couple (top view) 30
Painting on the blackboard 5
Male in a white suit with a PC 2
Characters written in chalk 6
Blackboard hung on the wall 18
High school student studying
High school girl with textbook
A teacher who wears a mask and teaches
Male wearing white coat touching biceps 3
Male in white coat with instruction stick 3
Chalk, chalk, pencil and protractor
Men in the graph on the blackboard 9
Handwritten Icon 67
Female college student standing in front of the blackboard 6
High school girl with a textbook
Woman in kimono holding a blackboard
High school students staring at each other
Female with a mini blackboard
Businessman with luggage 11
A high school student with his hands behind his back in front of a blackboard in a miniskirt
Picture 7 written in chalk 7
Girls with a blackboard 3
blackboard
Picture written in chalk 5
Male wearing a white gown with abdominal pain 2
Picture written with chalk 4
High school girl writing on the blackboard
Male in white coat with chalk 3
Curve graph drawn with chalk
Female college student 6 reading a book in front of the blackboard
Girl scribbling 10
A high school student (right) pointing up in front of a blackboard
Male wearing a white coat to support 1
Male wearing a white coat carrying a book 1
Male wearing a white coat to support 2
Men 1 looking at the graph on the blackboard
Handwritten Icon 33
Handwritten Icon 56
A blackboard on which a balloon of a graph is drawn and a man 2
Handwritten Icon 13
Handwritten Icon 119
Handwritten icon 8
Characters written on the blackboard 6
Woman holding a blackboard
Girl who graffiti 18
Blackboard and Spanish boy 5
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