codes used in sub samples - C+Y , Lp , U , Dp , C , Eld , Eth min, - definitions here
http://dundrumssailingclubruralchallenge2012.blogspot.co.uk/2012/12/dard-rural-challenge-2012-definitions.html
C&Y = 0/3
Lp = 0/3
U = 1/3
Dp = 1/3
C = 0/3
Eld = 1/3
Eth min = 0/3
100% Eld +Dp +U