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middle age grey-haired man teacher teaching maths lesson at university classroom
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middle
age
greyhaired
man
male
adult
elderly
mature
person
handsome
senior
smiling
book
books
student
study
education
standing
teacher
teach
teaching
working
glasses
knowledge
class
lesson
professor
learn
learning
board
white
chalkboard
explaining
explanation
maths
mathematics
exercise
jacket
clipboard
checklist
document
room
classroom
school
indoor
interior
indoors
college
library
university