Develop melodies adhering to the specified musical structure and using the offered theme.
X:1
L:1/8
Q:1/4=140
M:2/4
K:Bb
['B2 d/c/B/A/ BFDF', 'B,2 dBfd cAfA BGcB A F2 A'  
X:1
L:1/8
Q:1/4=140
M:2/4
K:Bb
 B2 d/c/B/A/ | BFDF | GBFD | E C2 F | B2 d/c/B/A/ | BFDF | GBFE | DB, B,2 :: dBfd | cAfA | BGcB | 
 A F2 A | GEAE | FDBD | ECFE"^NB" | DB, B,2 :|  