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