pk1,pk2,pk3,content
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