blackboard
chalk
chalkboard
child
childhood
class
classroom
concentration
concept
education
elementary
forums
girl
hard
head
intelligence
kid
knowledge
learn
lesson
math
mathematics
of students
school
schoolgirl
science
scratching
smart
solution
study
test
think
thoughtful
too difficult
tranquility
view
wisdom
work
定額
Schoolgirl thinks on the difficult task of mathematics on blackboardの素材 [FY31065306649]
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