Blackboard icon.
Schlüsselwörter
blackboard,
classroom,
school,
class,
border,
education,
blackboard,
chalk,
back,
shadow,
frame,
elementary,
cognition,
college,
background,
bulletin,
black,
blank,
student,
lecture,
university,
instructing,
lesson,
message,
information,
seminar,
learn
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