Build a musical piece by incorporating the given motif into the prescribed form.
X:1
L:1/8
M:2/4
K:D
['a>f ec', 'ce ec df'  
X:1
L:1/8
M:2/4
K:D
|: a2 a>f | ec a>f | ec a>f | ec BA | a2 a>f | ec a2 | ce BB/c/ | BA A2 :: B | ce ec | df fd | 
 ce eA/B/ | cB BA/B/ | ce ec | df f2 | ec B>c | BA A2 :|  