equation icon  [ HaSbncd(x,y) = - Im \~/ ax \~/ cyGFn(x, y) \~/ bx \~/ dyGFn(x, y) + \~/ ax \~/ dyGFn(x, y) \~/ bx \~/ cyGFn(x, y) ab e c x d - g (x) \~/ x \~/ yGFn(x, y) \~/ e \~/ yGFn(x, y) - gcd(y) \~/ a \~/ eG (x,y) \~/ b \~/ y G (x,y) x y Fn x e Fn + 1gab(x)gcd(y) \~/ e \~/ f G (x,y) \~/ x \~/ y G (x,y) 2 x y Fn e f Fn +Kab (2 \~/ c G (x, y) \~/ d G (x, y)- gcd(y) \~/ e G (x,y) \~/ y G (x,y)) x ( y Fn y Fn y Fn e Fn ) +Kcdy 2 \~/ axGFn(x, y) \~/ bxGFn(x, y)- gab(x) \~/ exGFn(x, y) \~/ xeGFn(x, y) ab cd( 2 )] +2K x K y G Fn(x,y) , (39)