Proof of proveit.logic.sets.equivalence.set_equiv_transitivity theorem

import proveit
theory = proveit.Theory() # the theorem's theory

%proving set_equiv_transitivity

With these allowed/disallowed theorem/theory presumptions (e.g., to avoid circular dependencies), we begin our proof of
set_equiv_transitivity:
(see dependencies)

set_equiv_transitivity may now be readily provable (assuming required theorems are usable).  Simply execute "%qed".