pk1,pk2,sortable_with_nulls
c,n,
h,n,0.7114009771190007
g,n,0.7470141234297678
e,n,0.8696016832340685
f,n,0.44338308606070165
b,n,0.43818457300770985
d,n,0.8326283633270679
a,n,