Black chalkboard with the chemical formula of Caffeine
Palabras clave
blackboard,
chalk,
blackboard,
class,
college,
handwriting,
high school,
learning,
research,
school,
scientific,
scripture,
studying,
teacher,
university,
write,
formula,
education,
science,
student,
written,
graphic,
sketching,
person,
billboard,
message,
drawing,
molecular,
molecular,
chemist,
stimulant,
scientist,
atomic,
illustration,
substance,
technology,
text,
element,
chemistry,
abstract,
structure,
letter,
drug,
chemical,
caffeine
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