Ключевые слова: business, businessperson, button, class, classroom, closeup, college, computer, computing, cropped, education, electronics, female, focus, foreground, group, highschool, informatics, input, keyboard, keypad, lesson, lifestyle, line, male, man, pc, people, person, posing, pressing, pushing, row, selective, students, studying, technology, training, typing, unrecognizable, unrecognized, user, using, vertical, woman,