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:Dmix
['A/B/A/G/ FG', 'gf dc']  
X:1
L:1/8
M:2/4
K:Dmix
 d>c | A/B/A/G/ FG | A/B/c/A/ BG | A/B/A/G/ FG | Ad d>c | A/B/A/G/ FG | A/B/c/A/ BG | A/B/A/G/ FG | 
 Ad || d>e | fd gf | dc Ad/e/ | fa gf | d2 dA/d/ | fa gf | dc A>B | cB cA | G2 c>B ||  