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  public boolean isSubSetOf(IntegerSet other) {	  	  int i = 0;	  boolean isSubSet = true;	  	  other.removeDuplicates();	  this.removeDuplicates();	  	    while (i < this.elements.size()) {	        Integer item = this.elements.get(i);	        int j = 0;	        boolean elementInSet = false;	        	        while (j < elements.size()) {	          if (item.equals(other.elements.get(j))) {	            elementInSet = true;	          }	          j++;	        }	        	        if (!elementInSet) {	         isSubSet = false;	        }	        	        i++;	   }	    	   return isSubSet;  }