input: Write a python function to classify a list of numbers into "low", "mid", and "high" categories based on given thresholds.
  assert classify_list([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]) == {"low": [1, 2, 3], "mid": [4, 5, 6, 7, 8, 9], "high": [10, 11]}
  assert classify_list([0, 3, 4, 7, 10, 15, 2]) == {"low": [0, 3, 2], "mid": [4, 7], "high": [10, 15]}
  assert classify_list([5, 1, 14, 8, 3, 9]) == {"low": [1, 3], "mid": [5, 8, 9], "high": [14]}
output: def classify_list(numbers):
      thresholds = {"low": 3, "mid": 9}
      result = {"low": [], "mid": [], "high": []}
      
      for number in numbers:
          if number <= thresholds["low"]:
              result["low"].append(number)
          elif number <= thresholds["mid"]:
              result["mid"].append(number)
          else:
              result["high"].append(number)
      
      return result