Compose a piece using the alphabetic notation of the assigned musical structure and the provided melodic motif.
X:1
L:1/8
M:4/4
K:Bmin
['FBBB FBBB', 'Acec Acec']  
X:1
L:1/8
M:4/4
K:Bmin
|: FBBB FBBB | FBdB c2 c2 | FBBB FBBB | fedc B2 B2 | FBBB FBBB | FBdB c2 c2 | FBBB FBBB | 
 fedc B2 B2 ::[K:D] Acec Acec | dcdf aa a2 | Acec Acec | dead A2 A2 | Acec Acec | dcdf aa a2 | 
 Acec Acec | dfaf d2 d2 :|  