albert
alphabet
background
black
blue
board
brown
bulletin
calculate
class
concept
cork
corkboard
e
education
emc
emc2
energy
equation
formula
frame
green
mass
math
mathematics
mc2
note
number
object
physics
relativity
school
science
solution
study
symbol
teacher
text
theory
toy
university
wallpaper
yellow
定額
E=MC2 wording on corkboard backgroundの素材 [FY31058707790]
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