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serious senior strict teacher holding book and pen
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dreamstime
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60s
adult
aged
annoyed
bad
blackboard
business
chalk
class
classroom
college
concerned
demanding
education
elderly
equations
exam
failure
glasses
grandpa
instructor
learn
lecture
male
man
master
mathematics
maths
mature
off
old
people
posing
principal
professor
reform
retirement
school
schoolteacher
skeptical
stern
students
study
teacher
teaching
test
university
work
wrong