>
>
> I could use an array, but one product can correspond to different number 
> of bases.
>
> That's why I decided to use tuples.
>
> You could use an Array of (different length) Arrays, similar to Array of 
Tuples.


Another strategy might be to construct a vector of (Product, Base) pairs, 
and then iterate over this vector:

product_bases = Tuple{ProductType, BaseType}[]

for k in Products, b in Bases
    if accordance[k,b]
        push!(product_bases, (k,b))
    end
end

for (k,b) in product_bases
    ...
end


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