Construct a piece of music using the designated motif as the basis, while ensuring the required form is followed.
X:1
L:1/8
M:2/4
K:Bb
['F B>F Bc d2 B/c/d/e/ ff/g/ fe', "z B/d/ db b/c'/b/a/ bd ef g/b/g/e/"  
X:1
L:1/8
M:2/4
K:Bb
 F | B>F Bc | d2 B/c/d/e/ | ff/g/ fe | d2 ba | g>f ed | cb ag | f2 =e/f/g/e/ | f2 z F | B>F Bc | 
 d2 B/c/d/e/ | ff/g/ fe | d2 ba | g>f ed | cb ag | f2 =e/f/g/e/ | f2 z |: B/d/ | db b/c'/b/a/ | 
 bd ef | g/b/g/e/ f/g/f/d/ | B2 d/e/d/c/ | ce ga/g/ | fc e/f/e/d/ | B4- | B2 z :|  