Compose a piece using the alphabetic notation of the assigned musical structure and the provided melodic motif.
X:1
L:1/8
M:2/4
K:G
['GB GB', 'gf ed']  
X:1
L:1/8
M:2/4
K:G
 GB GB | GB d2 | Ac BA | GB d2 | ce ge | dB d2 | AB/c/ BA | G2 G2 :: gf ed | gf ed | gf ed | 
 c B A2 | fe d2 | fe d2 | d2 Ac | BG G2 :|  