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