* Change {4 to 2} Part Black 3004 Brick 1 x 2
* Change {6 to 7} Part Black 3021 Plate 2 x 3
* Change {20 to 21} Part Red 3001old Brick 2 x 4 without Cross Supports
* Change {8 to 6} Part Red 3002old Brick 2 x 3 without Cross Supports
* Change {14 to 15} Part Red 3003old Brick 2 x 2 without Inside Supports
* Change {4 to 2} Part Black 3004 Brick 1 x 2
* Change {6 to 7} Part Black 3021 Plate 2 x 3
* Change {20 to 21} Part Red 3001old Brick 2 x 4 without Cross Supports
* Change {8 to 6} Part Red 3002old Brick 2 x 3 without Cross Supports
* Change {14 to 15} Part Red 3003old Brick 2 x 2 without Inside Supports
3) There are five 2x2 red brick on blue house, and 10 more on the white house.
Total=15
I assume symmetry on the red roof of white house. So on the side we don't
see, I assume there are six 2x2 red bricks on levels 2,4 and 6 (from bottom
to top)