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