background
blackboard
board
chalk
chalkboard
class
classroom
closeup
college
complex
concept
education
female
formula
formulas
german
grammar
green
hand
human
knowledge
language
learn
lecture
lesson
letter
letters
pattern
people
process
professor
school
science
sentence
sentences
sign
student
study
syntactic
teach
teacher
teaching
university
woman
wooden
word
words
write
writing
定額
Teacher hand writing grammar sentences on blackboard backgroundの素材 [FY31046467100]
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