public void pop(){
  int size=level.size() - 1;
  Object ob=level.remove(size);
  if (ob != null) {
    symb=(SymbMap)ob;
    if (size == 0) {
      cloned=false;
    }
 else {
      cloned=(level.get(size - 1) != symb);
    }
  }
 else {
    cloned=false;
  }
}

public void pop ( ) { int size = level . size ( ) - 1 ; Object ob = level . remove ( size ) ; if ( ob != null ) { symb = ( SymbMap ) ob ; if ( size == 0 ) { cloned = false ; } else { cloned = ( level . get ( size - 1 ) != symb ) ; } } else { cloned = false ; } }
pop a frame . inclusive or exclusive .
