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