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