def METHOD_NAME():
  dates = ['1', '2', '3', '6', '7', '8', '10', '12', '15', '16', '20', '23', '30', '40']
  assert_equal(['1-3', '6-8', '10-10', '12-12', '15-16', '20-20', '23-23', '30-30', '40-40'], Coordinator.aggreate(dates))