Example
--
IntSet \not<= FatSet
FatSet
--
insert, select, size
IntSet
--
insert, delete, select, size
History property
-- not satisfied by
IntSet
\A s : FatSet. \A %f, %q : State. %f < %q /\ s \e dom (%q).
\hspace{2cm}
\A x : Int. x \e s_{%f} => x \e s_{%q}
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History properties -- example