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professor teaching employees
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dreamstime
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25s
40s
60s
adults
age
american
board
caucasian
class
clothes
coach
college
concentration
course
different
elderly
employees
european
faces
female
group
happiness
having
indoor
inside
institute
knowledge
listening
male
ordinary
people
person
positive
professor
refresher
scheme
school
session
smile
student
study
table
taking
teacher
teaching
training
wellness