├ bicycle
   │ └ Maintenance Supplies
   │    ├ Bicycle Tools
   │    ├ degreaser
   │    ├ Cleaner, wax
   │    ├ Brushes, cleaning tools
   │    ├ Maintenance Stand
   │    ├ balance beam (in gymnastics)
   │    └ Other maintenance supplies
   └ automobile
         └ Cooling system
            └ Electric fan
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