Suppose we have two folders A and B , both contain images.
Let folder A have 6 images:a1,a2,...,a6
folder B have 60 images: b1,b2,...,b60.
I want to select 10 images in B for each image in A, in the following way
for a1 select b1,b2,...,b10
for a2 select b11,b12,...,b20
for a6 select b51,b52,...,b60