Develop melodies adhering to the specified musical structure and using the offered theme.
X:1
L:1/8
M:2/4
K:Cdor
['B2 cd ed cB', 'fe df fe dc c2'  
X:1
L:1/8
M:2/4
K:Cdor
 B2 cd | ed cB | d2 d2 | B2 cd | ed cB | c2 c2 :: fe df | fe dc | c2 f2 | fe df | fe dc | c2 c2 :|  