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:Dmix
['A3 B', 'A3 g fded']  
X:1
L:1/8
M:4/4
K:Dmix
 FG | A3 B AGFG | AccB c2 Bc | A3 B AGFE | DGGF G2 FG | A3 B AGFG | Adde f3 g | afge fded | 
 dcAF G2 :| FG | A3 g fded | Add^c dAFG | A3 g fded | dcAF G2 FG | A3 g fded | Add^c defg | 
 afge fded | dcAF G2 :|  