Ключевые слова: abstract background, backdrop, beige color, blue ink, business, care, cheap, college, concept, container, convenience, copy space, design, device, dose, draw, drops, education, empty, empty cartridge, equipment, filling, fountain pen, handwriting, instrument, isolated, leaking, learning, lifestyle, liquid, messy, monitoring, nib, nobody, notes, object, office, paper, pen, plastic, reservoir, school, single, spray, stain, studies, tank, transparent, white background, writing,