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