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To construct a ZDD, recall that a ZDD is a data structure to store a set of sets of some elements. For instance, the set of sets of integers {{2}, {3}, {2,3}} is stored this way:

For the ZDD of a propositional logic formula, we want to store the minterms. For the minterms which are represented as set of sets of variables {{a,b,c},{a,c},{a},{c},{}} and to this end, we first decompose the set of sets of states by variable a (see page 142 of the related chapter):