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:Bb
['B2 z']  
X:1
L:1/8
M:2/4
K:Bb
 F | BBFF | GGF z | B2 GA | B2 z F | DEFe | d2 Bd | ccBA | B2 z F/F/ | B2 FF/F/ | G2 FF | B2 GA | 
 B2 z F | BBce | d2 Bd | ccBA | B2 z |]  