Write a musical work incorporating the specified theme and letter-based framework.
X:1
L:1/8
M:4/4
K:Amix
['', 'af ec c2 ecAc', 'ea a2']  
X:1
L:1/8
M:4/4
K:Amix
 af |: ec c2 ecAc | ecAB c2 af | ec c2 ecAc | dBGB d2 af | ec c2 ecAc | ecAB c2 cd | 
 ea(3aaa eged |1 BABd e2 af :|2 BABd e2 cd |: ea a2 eg g2 | efed BABd | ea a2 eg g2 | 
 edBd eA (3AAA | ea a2 eg g2 | efed BABd | ea a2 eged |1 BABd e2 cd :|2 BABd e2 af ||  