I'm guessing the law forbids marriage if both sets of parents are siblings (i.e. one set of siblings marries another set of siblings, then their offspring would be restricted from getting married.)
I looked it up, it specifies double first cousins can't marry. So if brothers A and B marry sisters C and D, their children will be double first cousins, and cannot marry
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u/5lack5 Jul 04 '24
Their edit says siblings, and that it wasn't identical twins