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    College students taking test at desks in classroom — Stock Photo
    College students taking test at desks in classroom
    Friend supervising her friend as she descendes steep cliff in Wales — Stock Photo
    Friend supervising her friend as she descendes steep cliff in Wales
    Engineer working in factory, holding check-list and supervising. — Stock Photo
    Engineer working in factory, holding check-list and supervising.
    Teacher supervising high school students taking exam at desks — Stock Photo
    Teacher supervising high school students taking exam at desks
    Formal man with tablet checking inspecting workshop. — Stock Photo
    Formal man with tablet checking inspecting workshop.
    Portrait confident supervisor in steel factory — Stock Photo
    Portrait confident supervisor in steel factory
    Engineer working in factory, holding check-list and supervising. — Stock Photo
    Engineer working in factory, holding check-list and supervising.
    Professor watching college students taking test at desks in classroom — Stock Photo
    Professor watching college students taking test at desks in classroom
    High school teacher supervising students taking exam at tables — Stock Photo
    High school teacher supervising students taking exam at tables