The blue boxes below 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