private void displayPairs(String numberString, int sum) {
		int numPairs = 0;
		int[] numArr;
		int i;
		int frontPointer, backPointer;
		int tmpSum;
		
		String[] num = numberString.split(",");
		numArr = new int[num.length];
		
		for (i = 0; i < num.length; i++) {
			numArr[i] = Integer.parseInt(num[i]);
		}
		
		frontPointer = 0;
		backPointer = num.length - 1;
		
		while (frontPointer < backPointer) {
			tmpSum = numArr[frontPointer] + numArr[backPointer];
			
			if (tmpSum == sum) {
				numPairs++;
				if (numPairs == 1) {
					System.out.print(numArr[frontPointer] + "," + numArr[backPointer]);
				} else {
					System.out.print(";" + numArr[frontPointer] + "," + numArr[backPointer]);
				}
				frontPointer++;
				backPointer--;
			} else if (tmpSum > sum) {
				backPointer--;
			} else {
				frontPointer++;
			}
		}
		
		if (numPairs == 0) {
			System.out.println("NULL");
		} else {
			System.out.println();
		}
	}