background
black
blackboard
board
brain
building
calculate
calculationback
class
college
concept
education
educator
energy
equation
female
formula
genius
hand
high
hold
human
knowledge
learn
lesson
math
mathematical
mathematics
number
paper
physics
quantum
school
science
student
study
studying
success
symbol
teacher
text
theory
university
white
woman
write
定額
teacher draw condition of phase synchronismの素材 [FY31022373767]
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