Ключевые слова: a4, architecture, background, black, blank, blueprint, cell, centimeter, check, design, education, element, geometric, geometry, graph, graphic, graphpaper, gray, grey, grid, illustration, illustrator, line, math, mathematics, mm, net, note, notebook, notepad, page, paper, pattern, photo, plotting, school, seamless, sheet, simple, sketch, square, stripe, template, texture, tile, wall, wallpaper, white,