// $not($for($variable,$type,$not($formula))) -> $ex($variable,$type,$formula)
if (formula instanceof Not) {
Not not = (Not)formula;
Formula formula1 = not.getFormula();
if (formula1 instanceof For) {
For for1 = (For)formula1;
Formula formula2 = for1.getFormula();
if (formula2 instanceof Not) {
Formula formula3 = ((Not)formula2).getFormula();
Ex ex = new Ex(for1.getVariable(), for1.getType(),formula3);
changed.isChanged = true;
return ex;
}
}
}