000 //set all to 0
001 //increment digit at index size-1
002 //"            " last number full
010 //increment digit at index size-2, set all digits after to 0
011 //increment digit at index size-1
012 //"           " last number full
022 //increment digit at index size-2, digit full
100 //increment digit at index size-3, set all digits after to 0
// stop when first digit is full

i=size-1; i--
	while(array)
        array[i]++
	when array full
		if (i-1 < 0) return;
		array[i-1]++
		for j < size-1
			array[j]=0
		i=size-1
		break