Devise a harmonic structure to support the present melody.
ef | g2 gf gedc | BGAc BG G2 | B3 B cBAG | FGAB A2 ef | g2 gf gedc | BGAc BG G2 | 
 B3 B cBAG | FGAF G2 :: A2 | B3 B cBAG | BGBG cB c2 | B3 B cBAG | FGAB A2 A2 | 
 B3 B cBAG | BGBG cB c2 | B3 B cBAG | FGAF G2 :|  
X:1
L:1/8
M:2/2
K:G
 ef |"G" g2 gf gedc | BGAc BG G2 | B3 B cBAG |"D" FGAB A2 ef |"G" g2 gf gedc | BGAc BG G2 | 
 B3 B cBAG |"D" FGAF"G" G2 :: A2 |"G" B3 B cBAG | BGBG"C" cB c2 |"G" B3 B cBAG |"D" FGAB A2 A2 | 
"G" B3 B cBAG | BGBG"C" cB c2 |"G" B3 B cBAG |"D" FGAF"G" G2 :|  