Build a musical arrangement using the indicated alphabet-based system and the given motif.
X:1
L:1/8
M:4/4
K:Amix
['ec B2 cAAB', 'fa ecef a2 af ecBc', 'cffe f2']  
X:1
L:1/8
M:4/4
K:Amix
|: ec B2 cAAB | c2 cB ceaf | ec B2 cAAB | cffe f2 fa :| ecef a2 af | ecBc ecca | fefg a2 ec | 
 Bffe f2 fa | ecef a2 af | ecBc ceaf | ec B2 cAAB | cffe faec |]: B2 cB AAAB | c2 cB ceaf | 
 ecBc AAAB |1 cffe f2 ec :|2 cffe f2 fg | a2 ea aefa | efae faec | aeea feac | Bffe f2 fg | 
 a2 fa f2 fa | eAfe ceaf | ecBc AAAB | cffe f2 fa |]  