}
}
if (form instanceof ComparisonFormula) {
ComparisonFormula f = (ComparisonFormula)form;
if (f.op() == ExprCompOperator.SUBSET) {
if (!simplify_in(f.left(), f.right())) return false;
}
if (f.op() == ExprCompOperator.EQUALS) {
if (!simplify_in(f.left(), f.right())) return false;
if (!simplify_in(f.right(), f.left())) return false;
}