Ключевые слова: abstract, back, backdrop, background, blank, blue, book, business, cage, cell, clean, design, document, education, empty, exercise, grid, illustration, leaf, letter, line, lined, list, margin, math, memo, message, note, notebook, notepad, office, pad, page, paper, pattern, school, sheet, size, space, square, squared, striped, study, template, texture, vertical, wallpaper, white, write,