Ключевые слова: 3, arm, background, body, caucasian, communicate, communication, concept, concepts, count, counting, digit, education, elementary, female, finger, fingers, gesture, gesturing, girl, group, hand, help, helping, human, male, many, math, mathematics, moving, nail, nails, number, palm, people, person, show, showing, sign, skin, success, symbol, three, thumb, thumbs, woman, young,