>>> from race import min_time

>>> ltime = [['Bolt',9.74,9.82,9.58,10.02],['Carter',10.05,10.0,9.91],
... ['Powell',9.93,9.9,9.74],['Gatlin',10.01,9.95,10.02],
... ['Jacobs', 9.69, 9.71, 9.81], ['Jonhson', 9.65, 9.72, 9.64, 9.74],
... ['Omanyala', 9.72, 9.71, 9.68, 9.74], ['Silva', 9.81, 9.76, 9.77]]
>>> min_time(ltime)
[9.58, 9.64, 9.68, 9.69, 9.74, 9.76, 9.91, 9.95]
>>> min_time(ltime[:4])
[9.58, 9.74, 9.91, 9.95]
>>> min_time(ltime[:6])
[9.58, 9.64, 9.69, 9.74, 9.91, 9.95]