pk1,pk2,pk3,content
a,a,r,a-a-r
a,b,r,a-b-r
a,c,r,a-c-r
a,d,r,a-d-r
a,e,r,a-e-r
a,f,r,a-f-r
a,g,r,a-g-r
a,h,r,a-h-r
a,i,r,a-i-r
a,j,r,a-j-r
a,k,r,a-k-r
a,l,r,a-l-r
a,m,r,a-m-r
a,n,r,a-n-r
a,o,r,a-o-r
a,p,r,a-p-r
a,q,r,a-q-r
a,r,r,a-r-r
a,s,r,a-s-r
a,t,r,a-t-r
a,u,r,a-u-r
a,v,r,a-v-r
a,w,r,a-w-r
a,x,r,a-x-r
a,y,r,a-y-r
a,z,r,a-z-r
b,a,r,b-a-r
b,b,r,b-b-r
b,c,r,b-c-r
b,d,r,b-d-r
b,e,r,b-e-r
b,f,r,b-f-r
b,g,r,b-g-r
b,h,r,b-h-r
b,i,r,b-i-r
b,j,r,b-j-r
b,k,r,b-k-r
b,l,r,b-l-r