% EXPECT: sat
OPTION "logic" "ALL_SUPPORTED";
IntPair: TYPE = [INT, INT];
w : SET OF IntPair;
z : SET OF IntPair;
x : INT;
y : INT;

ASSERT (1,x) IS_IN w;
ASSERT (y,2) IS_IN z;

ASSERT NOT (1, 2) IS_IN ( w JOIN z );

CHECKSAT;