% EXPECT: unsat
OPTION "logic" "ALL";
IntPair: TYPE = [INT, INT];
x : SET OF IntPair;
y : SET OF IntPair;

z : IntPair;
ASSERT z = (1,2);
zt : IntPair;
ASSERT zt = (2,1);
ASSERT (x = y);
ASSERT z IS_IN x;
ASSERT NOT (zt IS_IN TRANSPOSE(y));

CHECKSAT;