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plan a crossed out and plan b written with a chalk on the blackboard
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dreamstime
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abstract
aritmetica
background
black
blackboard
board
bright
catorce
chalk
close
crossed
cycle
cycles
decimales
detail
developed
early
equivalence
escuela
factory
formula
full
griego
infinite
inside
instituto
isolated
its
letra
matematicas
matem̮̉̉
natural
npythagorean
number
numbers
pitagoras
plan
pythagorean
scheme
septiembre
signo
still
teorema
texture
theorem
ticas
tres
white
written