Construct musical melodies following the designated letter arrangement and the given motif.
X:1
L:1/8
M:4/4
K:F
['B A']  
X:1
L:1/8
M:4/4
K:F
 A/ | c d e3/2 d/ | c B A3/2 A/ | B A c B | A G F z/ F/ | E D B A | ^G E A3/2 A/ | =G F c B | 
 A G F z/ F/ | E D B A | d3/2 c/ A3/2 A/ | B =B c _B | A G F z/ x/ |]  