What are the ten essentials? Give your answer in JSON, with the name and examples of each essential.
The ninth edition of Mountaineering: The Freedom of the Hills, published in 2017, defines the Ten Essentials as:
 
 Navigation: map, altimeter, compass, GPS device, personal locator beacon
 Headlamp: with LED bulb and spare batteries
 Sun protection: sunglasses, sun protective clothing, sunscreen
 First aid: a first aid kit, wrapped in waterproof packaging
 Knife: hikers on a short trip may also carry a multi-tool, strong adhesive tape and cordage; on a longer trip, further small tools may be useful
 Fire: the means to both start and sustain a fire; either a butane lighter or matches, or other fire making device. Firestarters for igniting even wet wood, and in areas where no firewood will be available, a stove is highly advisable.
 Shelter: plastic tube tent, jumbo plastic trash bag or bivy sack
 Extra food: at least one day's food for a short hike, that should require no cooking.
 Extra water: drinking water and the skills and tools to purify water
 Extra clothes: additional items may be needed if spending the night in the emergency shelter
 
 https://en.wikipedia.org/wiki/Ten_Essentials
[
  {"name": "Navigation", "examples": ["map", "altimeter", "compass", "GPS device", "personal locator beacon"]},
  {"name": "Headlamp", "examples": ["LED headlamp", "spare batteries"]},
  {"name": "Sun protection", "examples": ["sunglasses", "sun protective clothing", "sunscreen"]},
  {"name": "First aid", "examples": ["first aid kit"]},
  {"name": "Knife", "examples": ["knife", "multi-tool", "tape", "cordage"]},
  {"name": "Fire", "examples": ["butane lighter", "matches", "firestarters", "stove"]},
  {"name": "Shelter", "examples": ["plastic tube tent", "jumbo plastic trash bag", "bivy sack"]},
  {"name": "Extra food", "examples": ["at least one day's food"]},
  {"name": "Extra water", "examples": ["drinking water", "skills and tools to purify water"]},
  {"name": "Extra clothes", "examples": ["items to spend the night"]}
 ]