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$7.99Tessellation Patterns Coloring Book for Young Adults & Teens: Terrific Geometric Patterns, Mandala Tesselations, 3D Dimensions, Optical Illusion, Abstract shapes, Fractal Coloring Book for RelaxationAmazon- $99.99OUZINE Linear Optical Ruler 0.5U 0.0005MM Linear Optical Ruler Scales 5V TTL DB9 Dimensions 50 100 150 200 250 300 350 400 450 500MM (Color : 0.5u 50MM)Amazon