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2. Sliding glass door - Wikipedia

   en.wikipedia.org/wiki/Sliding_glass_door

   Swinging glass doors are a better choice than the typical sliding glass doors, since they offer a much tighter seal, [7] but glass – even the best type of glass, chosen according to the climate zone – is always a poor insulator, making doors based on them a poor choice from a thermal comfort perspective.

3. Shoji - Wikipedia

   en.wikipedia.org/wiki/Shoji

   Shoji paper sliding doors in the Rinshunkaku at Sankei-en (Important Cultural Property) Shoji doors next to the tokonoma alcove, Rinshunkaku A tatami room surrounded by paper shoji (paper outside, lattice inside). The shoji are surrounded by an engawa (porch/corridor); the engawa is surrounded by garasu-do, all-glass sliding panels.

4. Door - Wikipedia

   en.wikipedia.org/wiki/Door

   Glass doors pose the risk of unintentional collision if a person is unaware there is a door, or thinks it is open when it is not. This risk is greater with sliding glass doors because they often have large single panes that are hard to see. Stickers or other types of warnings on the glass surface make it more visible and help prevent injury. In ...

5. Revolving door - Wikipedia

   en.wikipedia.org/wiki/Revolving_door

   Diagram of a revolving door, viewed from above. Around the central shaft of the revolving door, there are usually three or four panels called wings or leaves.Large diameter revolving doors can accommodate pushchairs and wheeled luggage racks - such large capacity doors are sometimes H-shaped to split the circle into only two (hence larger) parts.

6. Slide rule - Wikipedia

   en.wikipedia.org/wiki/Slide_rule

   For example, a 10 cm (3.9 in) circular would have a maximum precision approximately equal to a 31.4 cm (12.4 in) ordinary slide rule. Circular slide rules also eliminate "off-scale" calculations, because the scales were designed to "wrap around"; they never have to be reoriented when results are near 1.0—the rule is always on scale.

7. 15 puzzle - Wikipedia

   en.wikipedia.org/wiki/15_puzzle

   [2] [3] For the 15 puzzle, lengths of optimal solutions range from 0 to 80 single-tile moves (there are 17 configurations requiring 80 moves) [4] [5] or 43 multi-tile moves; [6] the 8 Puzzle always can be solved in no more than 31 single-tile moves or 24 multi-tile moves (integer sequence A087725). The multi-tile metric counts subsequent moves ...