Ключевые слова: 5, analysis, analyze, answer, ask, backdrop, background, blackboard, brainstorming, chalkboard, closeup, color, communication, concept, confusion, doubt, education, find, five, frequently, handwriting, handwritten, help, icon, idea, info, information, know, mark, nobody, paper, problem, question, questions, research, search, sign, solution, support, text, think, thinking, typography, unknown, what, when, where, who, why, word,