Produce a musical expression that follows the indicated alphabetical structure while integrating the provided thematic material.
X:1
L:1/8
M:2/4
K:A
['Ac EF A2 Af ec', 'ce ce a2']  
X:1
L:1/8
M:2/4
K:A
 Ac EF | A2 Af | ec BA | e/f/e/c/ BA | Ac EF | A2 Af | ec BA/B/ | cA A2 :: ce ce | a2 a>f | ec BA | 
 e/f/e/c/ BA | ce ce | a2 af | ec BA/B/ | cA A2 :|  