Iterator<Particle> iterator = particles.iterator();

        while(iterator.hasNext()) {

            Particle p = iterator.next();

            Iterator<Particle>downIterator = particles.iterator();
            while(downIterator.hasNext()) {

                Particle c = downIterator.next();
                if(!c.equals(p)) {

                    if(p.locationX.equals(c.locationX)&&
                            p.locationY.equals(c.locationY)&&
                            p.locationZ.equals(c.locationZ)
                            ) {


                        downIterator.remove();


                    }



                }

            }


        }