Develop a harmonic creation that incorporates the given motif and adheres to the specified alphabetical order.
X:1
L:1/8
Q:1/2=160
M:4/4
K:F
['Bb a d2 g2 e2 ^f2 g2', 'G4 Bcd_e d2 cB', 'G4 B2 B2 F2 F2 GABc d3']  
X:1
L:1/8
Q:1/2=160
M:4/4
K:F
"_key Bb a possibility" d2 g2 e2 ^f2 | g2 fe d3 e | fgf_e d2 cB | AGAB G4 :: Bcd_e d2 cB | 
 AGAB G4 | Bcd_e d2 cB | AGAB G4 :: B2 B2 F2 F2 | GABc d3 e | fgf_e d2 cB | AGAB G4 :|  