Ключевые слова: abstract, backdrop, background, blank, board, centimeters, concept, decoration, design, document, drawing, education, empty, engineering, frame, geometric, gradient, graph, graphic, grid, idea, illustration, industry, layout, length, line, math, mathematics, measure, metric, millimeter, office, paper, pattern, project, school, science, seamless, sheet, simple, square, study, technical, technology, template, wallpaper, web, write,