a zerotolerance
blackboard
bullying
chalk
chalkboard
chemistry
class
concept
cubes
educate
education
elements
furnaces
green
harassment
images
instruct
learn
nobody
noone
objects
periodic
periodic elements
picture
pictures
policy
punishment
royalty free photo
rules
school
sexual
sexual harassment
stock image
stock photograph
stock photographs
stock photos
study
table
teach
tolerance
train
word
zero
定額
word zero on an abstractly colored backgroundの素材 [FY310103398111]
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