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