First, I listed out all the letters of shapes in the diagram. Once I had done that I looked at the net of A. Then I thought about what could go with it. I found that A and H went together. After that, I worked systematically finding A a pair first then continuing through the alphabet( apart from I because it wasn't there). I crossed off the letters once I had found their pair on my list of letters. Once they had all been paired, these were the results I got:
Letter Pair
A H
B F
C P
D N
E K
G Q
J R
L M
O S