Abstract
Black holes in a class of string compactifications, known as STU models, carry four electric and four magnetic charges. Furthermore, a duality group, given by the product of three congruence subgroups of SL(2,\({{\mathbb {Z}}}\)), acts on these integer valued charges. By placing these eight charges at the eight corners of a Bhargava cube, we provide a classification of the duality orbits in these theories.
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