Operación matemática escrita a mano con una tiza en la pizarra
Schlüsselwörter
slate,
chalk,
chalk,
sigma,
study,
schooling,
letter,
jobbing,
idea,
board,
black,
schooling,
white,
word,
success,
book,
handwriting,
school,
signs,
marketing,
message,
handwritten,
plan,
symbol,
management,
hand,
drawing,
motivation,
write
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