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back to shool and work concept on green blackboard
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abc
abstract
add
algebra
alphabet
back
background
blackboard
board
chalk
class
college
concept
deduct
divide
drawing
education
elementary
empty
equation
figures
font
green
hand
illustration
knowledge
learn
literature
math
mathematics
minus
number
paper
plus
pointing
right
school
science
sheet
shool
sign
student
symbol
teacher
text
university
white
writing
wrong