addition
blackboard
chalkboard
class
creativity
education
equation
error
eureka
five
formula
handwritten
idea
idiom
illogical
incorrect
innovation
learning
lesson
math
mathematics
maths
metaphor
mistake
numbers
paradox
paradoxical
plus
problem
problems
proof
sign
solution
sum
symbol
teach
theory
two
wrong
定額
Two and two make five incorrect equation handwritten with white chalk on dirty blackboardの素材 [FY310104154294]
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