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