Compose a piece using the alphabetic notation of the assigned musical structure and the provided melodic motif.
X:1
L:1/16
M:4/4
K:Bb
['f6 fc']  
X:1
L:1/16
M:4/4
K:Bb
 c4 c2c2cBG>F F4 | GBc2 c4 f6 fc | cBcB G4 z4 G2F2 | GB c6 c6 f2 | f12 z4 | C2>F2F2>F2GB c6 | 
 c2 c4 f2 f6 fc | c4 cBcBG2z2G2>B2 | c6 f2cBcB G4 | F4 F12 |]  