pk1,pk2,sortable_with_nulls
a,a,
a,b,
a,c,
a,d,
a,h,
a,i,
a,j,
a,l,
a,n,
a,t,
a,u,
a,w,
a,z,
b,b,
b,c,
b,d,
b,g,
b,i,
b,l,
b,q,
b,t,
b,x,
b,z,
c,e,
c,i,
c,j,
c,n,
c,o,
c,s,
c,w,
c,x,
d,b,
d,d,
d,i,
d,m,
d,q,
d,r,
d,u,
d,v,
d,z,
e,c,
e,e,
e,f,
e,g,
e,h,
e,i,
e,m,
e,q,
e,t,
e,u,
f,a,
f,b,
f,c,
f,d,
f,f,
f,h,
f,o,
f,p,
f,r,
f,w,
g,b,
g,j,
g,k,
g,m,
g,s,
g,t,
g,y,
h,g,
h,i,
h,m,
h,r,
h,s,
c,r,0.0058960835839930725
b,v,0.024786361898188725
e,b,0.040231673144616176
f,k,0.045346811013382116
d,o,0.04551570098321833
g,d,0.051446079972376046
a,g,0.06955514882374092
g,h,0.06958542124833644
a,x,0.07099308600903254
b,s,0.07524386007376704
h,d,0.08150198744788395
e,a,0.0913268866309852
h,q,0.099083124393048
f,y,0.09917846167904198
g,z,0.10350187727039162
e,p,0.1262462698093887
f,e,0.13141180642048544
b,w,0.15919784298073125
g,g,0.1804160719608544
c,b,0.19007877450229604
e,k,0.19061037094792832
b,m,0.2131543122670404
c,p,0.21395287710598743
f,j,0.22136720007399002
d,k,0.24330516387675716
h,a,0.24774372359828423
d,w,0.26455462565889964
e,r,0.2650227795434089
f,t,0.26536750832497336
e,j,0.291861560261786
a,f,0.2931782814070929
b,o,0.2993787521999779
c,d,0.30928466220865325
d,a,0.3119572443946952
g,v,0.3161388944905802
a,s,0.3241560570046731
c,v,0.32684580488130854
h,c,0.32969075511772883
e,d,0.3298036635789654
b,r,0.33355653860508816
e,y,0.3455656244430817
a,e,0.3589793804846284
f,u,0.36203897381751204
f,i,0.3810254992724753
e,w,0.3825442986168739
g,o,0.3970711742472973
g,r,0.4004498163160871
g,p,0.40442288450523434
h,j,0.41085861149653347
h,p,0.4148969058190054
e,l,0.41494242355134514
g,i,0.41983249376450316
g,a,0.426764006260958
c,f,0.4298881499898346
e,v,0.43068678785540004
c,c,0.4312973996249869
c,a,0.43456375856464435
d,f,0.4355744930038943
b,n,0.43818457300770985
f,n,0.44338308606070165
c,m,0.44591361207670044
h,k,0.44892796303334037
f,z,0.4515549159652815
e,x,0.459570499176731
g,q,0.4600969018938087
d,g,0.46470846660323173
c,g,0.47318618590932626
d,j,0.4760931107841647
b,h,0.4767885171089349
g,e,0.4821893962043886
b,e,0.48564112545071847
d,h,0.48754993239134437
g,w,0.5073368852897782
a,y,0.5141561198085891
d,e,0.5217467469384799
d,s,0.5225725351302178
d,x,0.5445623787105787
f,q,0.5542077884611291
g,c,0.5616833815697281
d,p,0.5740642196263323
c,q,0.5840794142042252
a,m,0.5845859902235405
g,l,0.5931342503922638
b,j,0.5945191535334412
h,e,0.5950412281515748
d,t,0.6096309122451303
e,s,0.6267991790079878
f,x,0.6330767243010155
a,r,0.6389494948660052
c,u,0.6427496480093358
f,v,0.6433406842054887
c,l,0.6675777325863531
c,y,0.6694588446199107
b,k,0.6697259747698292
f,l,0.6704862188501712
h,l,0.6783068250650924
a,v,0.6898676320996214
d,l,0.7028549421857689
h,n,0.7114009771190007
b,a,0.7290758494598506
b,p,0.7424166839809987
e,o,0.7447051515651959
g,n,0.7470141234297678
d,y,0.7489577220696233
a,p,0.7508777995916097
c,h,0.7511381375407322
h,b,0.7744647885737355
b,u,0.7801162418714427
d,c,0.7826353463610196
d,n,0.8326283633270679
f,m,0.8336930832963215
e,z,0.8453039251425987
g,x,0.8552933714560903
b,y,0.8643529420302863
f,s,0.866447888506801
e,n,0.8696016832340685
f,g,0.8703969593250397
h,o,0.9053062089782412
a,k,0.913136124185545
b,f,0.9265180735593334
h,f,0.9471086244193812
g,u,0.9512921405795819
a,q,0.9538159275210801
c,k,0.9579660422795397
c,z,0.9637347441012087
g,f,0.9745466021257082
c,t,0.9807219775189232
a,o,0.9961213802400968
h,h,0.9999766211030285