a "null" ".2"
b "null" ".7"
c "null" ".15"
d "a" ".1 .8"
h "a b" ".1 .2 .3 .4"
i "b c" ".4 .3 .2 .1"
j "c" ".4 .6"
e "d" ".5 .2"
f "d" ".1 .44"
g "d" ".01 .11"
k "i" ".3 .3"