Ключевые слова: back, background, billboard, black, blackboard, blank, blue, board, brown, chalk, chalkboard, color, colorful, colour, concept, copy, desk, different, education, green, grunge, learning, lesson, lilac, lot, many, multi, multicoloured, nobody, old, piece, pieces, pink, red, school, space, studying, vintage, weathered, wiped, wooden, write, yellow,