if (firstFreeVarSpace > TNTMethods.FIRST_FREE_VAR_SPACE) {
TNTMethods.FIRST_FREE_VAR_SPACE = firstFreeVarSpace;
}
for (Variable v : allUsedVarsX) {
if (y.renameVariable(new Variable(v.getVarNum()), new Variable(TNTMethods.FIRST_FREE_VAR_SPACE))) {
TNTMethods.FIRST_FREE_VAR_SPACE++;
}
}
}