arm
background
black
blackboard
board
business
chalk
chalkboard
checkmark
classroom
close
communication
concept
copy
correct
cross
drawing
education
empty
error
green
hand
handwriting
holding
horizontal
human
learning
lesson
male
man
message
note
number
office
old
people
person
primary
school
space
symbol
teacher
teaching
texture
up
white
work
write
writing