score:2

Accepted answer
[
  { "from": 15, "to": 19, "count": 2 },
  { "from": 25, "to": 29, "count": 1 },
  { "from": 30, "to": 34, "count": 3 },
  { "from": 45, "to": 49, "count": 1 }
]

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