Formulate a musical piece by utilizing the specified motif and alphabet-based structure.
X:1
L:1/4
M:2/2
K:Dmin
['(c A)', 'a (f/g/) a']  
X:1
L:1/4
M:2/2
K:Dmin
|: (f d) d (e/f/) | (g c) c3/2 c/ | (d/e/) f e d |1 (c A) A2 :|2 (c A) A |: a | f2 f a | f2 f a | 
 (f/g/) a (f/g/) a | g e e2 | (e/f/) g (e/f/) g | f d (d/e/)f/g/ | a g/f/ (e/d/) e |1 d3 :|2 d4 |]  