sex	length
M	17.6
M	17.7
M	18.1
M	18.9
M	20.4
M	19.6
M	19.2
M	19.3
M	21.8
F	15.8
F	14.2
F	16.7
F	12
F	17.3
F	18.05
F	18
F	18.2
F	18.3