Ключевые слова: annual, annualy, blackboard, blue, chalk, chalkboard, chalkboards, chalks, class, classes, close up, concept, concepts, conceptual, education, english, font, fonts, frecuency, handwritten, horizontal, language, languages, learn, learning, letter, letters, meaning, message, messages, rounded, school, sign, signs, study, symbol, symbolism, symbols, teach, teaching, text, time, white, word, words, written, year,