Ключевые слова: background, backgrounds, blackboard, blue, blueish, board, cap, caps, chalk, chalkboard, chalkboards, class, classes, close up, color, colored, colors, colour, colours, concept, concepts, english, font, fonts, horizontal, independence, language, languages, learn, learning, letter, letters, meaning, message, messages, school, sign, signal, signals, signs, study, symbol, symbolism, symbols, teach, teaching, text, white, word, words, written,