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2. Packing problems - Wikipedia

   en.wikipedia.org/wiki/Packing_problems

   Packing squares in a square: Optimal solutions have been proven for n from 1-10, 14-16, 22-25, 33-36, 62-64, 79-81, 98-100, and any square integer. The wasted space is asymptotically O(a 3/5). Packing squares in a circle: Good solutions are known for n ≤ 35. The optimal packing of 10 squares in a square

3. Drawer - Wikipedia

   en.wikipedia.org/wiki/Drawer

   A white wooden drawer Filing card drawer. A drawer (/ d r ɔːr / ⓘ DROR) is a box-shaped container inside a piece of furniture that can be pulled out horizontally to access its contents. Drawers are built into numerous types of furniture, including cabinets, chests of drawers (bureaus), desks, and the like.

4. Double-stack rail transport - Wikipedia

   en.wikipedia.org/wiki/Double-stack_rail_transport

   Containers shipped between North America and other continents consist of mostly 40-foot (12.19 m) and some 45-foot (13.72 m) and 20-foot (6.10 m) containers. Container ships only take 40's, 20's and also 45's above deck. 90% of the containers that these ships carry are 40-footers and 90% of the world's freight moves on container ships; so 81% ...