The blue rectangles should be in numeric order and form a "B". (Boxes labelled "A" should be in the first column; boxes labelled "B" should be in the second; arrows indicate the correct alignment.)

⇦ A 1

⇦ B 2

⇦ A 3

B 4 ⇨

⇦ A 5

B 6 ⇨

⇦ A 7

⇦ B 8

⇦ A 9

B 10 ⇨

⇦ A 11

B 12 ⇨

⇦ A 13

⇦ B 14